Mercurial > octave
annotate NEWS @ 22761:708a4fcb7382 stable release-4-2-0
Version 4.2.0 released.
* configure.ac: Bump version to 4.2.0.
(OCTAVE_PATCH_VERSION): Set to 0.
(OCTAVE_RELEASE_DATE): Update.
author | John W. Eaton <jwe@octave.org> |
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date | Sun, 13 Nov 2016 10:20:59 -0500 |
parents | a918e983a943 |
children | ddbc3f9f0136 4e313457b5f9 |
rev | line source |
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1 Summary of important user-visible changes for version 4.2: |
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2 --------------------------------------------------------- |
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3 |
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4 ** The parser has been extended to accept, but ignore, underscore |
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5 characters in numbers. This facilitates writing more legible code |
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6 by using '_' as a thousands separator or to group nibbles into bytes |
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7 in hex constants. |
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8 |
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9 Examples: 1_000_000 == 1e6 or 0xDE_AD_BE_EF |
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10 |
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11 ** The parser has been extended to understand binary numbers which |
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12 begin with the prefix '0b' or '0B'. The value returned is Octave's |
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13 default numeric class of double, not at unsigned integer class. |
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14 Therefore numbers greater than flintmax, i.e., 2^53, will lose some |
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15 precision. |
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16 |
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17 Examples: 0b101 == 5 or 0B1100_0001 == 0xC1 |
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18 |
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19 ** gnuplot 4.4 is now the minimum version supported by Octave. |
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20 |
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21 ** The default set of colors used to plot lines has been updated to be |
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22 compatible with Matlab's new default color scheme. The line plot |
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23 color scheme can be set with the axes property "ColorOrder". |
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24 |
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25 ** The default colormap is now set to "viridis" which is also the |
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26 default colormap in matplotlib. This new colormap fixes some of the |
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27 main issues with the old default colormap "jet" such as its bad |
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28 "luminance profile" and is also more similar to Matlab's new default |
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29 colormap "parula". |
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30 |
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31 ** The colormap function no longer supports the input argument "list" |
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32 to show built-in colormaps. Use "help colormap" to find the |
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33 built-in colormaps. |
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34 |
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35 ** The graphics command "hold on" now ensures that each new plot added |
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36 to an existing plot has a different color or linestyle according to |
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37 the "ColorOrder" and/or "LineStyleOrder" properties. This is |
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38 equivalent to the old command "hold all" and was made for Matlab |
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39 compatibility. Existing code *may* produce differently colored |
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40 plots if it did not specify the color for a plot and relied on each |
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41 new plot having the default first color in the "ColorOrder" |
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42 property. |
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43 |
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44 ** When starting, Octave now looks in the function path for a file |
21395 | 45 startup.m and executes any commands found there. This change was |
46 made to accommodate Matlab users. Octave has it's own configuration | |
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47 system based on the file .octaverc which is preferred. |
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48 |
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49 ** Octal ('\NNN') and hex ('\xNN') escape sequences in single quoted |
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50 strings are now interpreted by the function do_string_escapes(). |
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51 The *printf family of functions now supports octal and hex escape |
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52 sequences in single-quoted strings for Matlab compatibility. |
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53 |
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54 ** Special octal and hex escape sequences for the pattern and |
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55 replacement strings in regular expressions are now interpreted for |
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56 Matlab compatibility. |
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57 |
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58 octal: '\oNNN' or '\o{NNN}' |
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59 hex : '\xNN' or '\x{NN}' |
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60 |
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61 ** Unknown escape sequences in the replacement string for regexprep are |
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62 now substituted with their unescaped version and no warning is |
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63 emitted. This change was made for Matlab compatibility. |
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64 |
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65 Example: regexprep ('a', 'a', 'x\yz') |
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66 => 'xyz' |
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67 |
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68 ** mkfifo now interprets the MODE argument as an octal, not decimal, |
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69 integer. This is consistent with the equivalent shell command. |
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70 |
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71 ** linspace now returns an empty matrix if the number of requested |
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72 points is 0 or a negative number. This change was made to be |
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73 compatible with Matlab releases newer than 2011. In addition, |
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74 Octave no longer supports matrix inputs for A or B. |
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75 |
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76 ** The cov function now returns the complex conjugate of the result |
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77 from previous versions of Octave. This change was made for |
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78 compatibility with Matlab. |
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79 |
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80 ** condest now works with a normest1 compatible syntax. |
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81 |
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82 ** The griddata function no longer plots the interpolated mesh if no |
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83 output argument is requested, instead the vector or array of |
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84 interpolated values is always returned for Matlab compatibility. |
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85 |
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86 ** The new function "light" and the corresponding graphics object |
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87 provide light and shadow effects for patch and surface objects. |
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88 |
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89 ** The surfnorm function now returns unnormalized (magnitude != 1) |
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90 normal vectors for compatibility with Matlab. |
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91 |
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92 ** The normal vectors returned from isonormals have been reversed to |
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93 point towards smaller values for compatibility with Matlab. |
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94 |
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95 ** The quadl function now uses an absolute, rather than relative, |
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96 tolerance for Matlab compatibility. The default tolerance is 1e-6 |
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97 which may result in lower precision results than previous versions |
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98 of Octave which used eps as the relative tolerance. The quadl |
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99 function has also been extended to return a second output with the |
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100 total number of function evaluations. |
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101 |
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102 ** The textscan function is now built-in and is much faster and much |
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103 more Matlab-compatible than the previous m-file version. |
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104 |
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105 ** Dialog boxes--errordlg, helpdlg, inputdlg, listdlg, msgbox, |
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106 questdlg, and warndlg--now exclusively use Qt for rendering. |
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107 Java based versions have been removed. |
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108 |
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109 ** The axes properties "TitleFontSizeMultiplier" and "TitleFontWeight" |
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110 are now implemented which control the default appearance of text |
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111 created with title(). |
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112 The axes property "LabelFontSizeMultiplier" is now implemented |
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113 which controls the default appearance of text created with |
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114 xlabel(), ylabel(), or zlabel(). |
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115 |
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116 ** The graphics property "box" for axes now defaults to "off". |
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117 To obtain equivalent plots to previous versions of Octave use |
22476 | 118 set (0, "DefaultAxesBox", "on"); |
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119 in your .octaverc file. |
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120 |
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121 ** The graphics property "boxstyle" has been implemented. The default |
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122 is "back" which draws only the back planes in a 3-D view. If the |
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123 option is "full" then all planes are drawn. |
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124 |
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125 ** The graphics property "erasemode" has been hidden, and will |
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126 eventually be removed. This property has also been removed |
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127 from Matlab, and was never implemented in Octave. |
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128 |
22476 | 129 ** The graphics property "graphicssmoothing" for figures now controls |
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130 whether anti-aliasing will be used for lines. The default is "on". |
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131 |
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132 ** The value "zero" for the axes properties "xaxislocation" and |
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133 "yaxislocation" has been deprecated and will be removed from |
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134 Octave 4.6. Use "origin" instead. |
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135 |
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136 ** The publish function allows easy publication of Octave script files |
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137 in HTML or other formats, including figures and output created by |
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138 this script. It comes with its counterpart grabcode, which lets one |
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139 literally grab the HTML published code from a remote website, for |
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140 example. |
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141 |
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142 ** The value of the MEX variable TrapFlag now defaults to 0, which will |
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143 cause Octave to abort execution of a MEX file and return to the |
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144 prompt if an error is encountered in mexCallMATLAB. |
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145 |
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146 ** The MEX API now includes the function mexCallMATLABWithTrap. This |
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147 function will not abort if an error occurs during mexCallMATLAB, but |
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148 instead will return execution to the MEX function for error |
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149 handling. |
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150 |
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151 ** The MEX API functions for input validation that begin with "mxIs" |
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152 (e.g., mxIsDouble, mxIsEmpty, etc.) now return type bool rather than |
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153 type int. |
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154 |
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155 ** The functions mxAssert and mxAssertS for checking assertions have |
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156 been added. In order to avoid a performance penalty they are only |
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157 compiled in to debug versions of a MEX file, i.e., that are produced |
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158 when the '-g' option is given to mex or mkoctfile. |
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159 |
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160 ** Other new MEX API functions include mexEvalStringWithTrap, |
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161 mxIsScalar, mxCreateUninitNumericArray, mxCreateUninitNumericMatrix. |
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162 |
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163 ** Other new functions added in 4.2: |
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164 |
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165 audioformats |
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166 camlight |
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167 condeig |
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168 deg2rad |
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169 dialog |
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170 evalc |
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171 hash |
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172 im2double |
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173 isocaps |
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174 lighting |
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175 localfunctions |
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176 material |
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177 normest1 |
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178 ode23 |
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179 ode45 |
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180 odeget |
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181 odeplot |
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182 odeset |
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183 padecoef |
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184 profexport |
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185 psi |
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186 rad2deg |
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187 reducepatch |
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188 reducevolume |
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189 smooth3 |
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190 uibuttongroup |
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191 |
20484 | 192 ** Deprecated functions. |
193 | |
194 The following functions have been deprecated in Octave 4.2 and will | |
195 be removed from Octave 4.6 (or whatever version is the second major | |
196 release after 4.2): | |
197 | |
198 Function | Replacement | |
199 ---------------------|------------------ | |
20486 | 200 bitmax | flintmax |
20502 | 201 mahalanobis | mahal in Octave-Forge statistics pkg |
20913
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New function hash to calculate MD{2/4/5} and SHA{1,244,256,384,512} hash values.
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202 md5sum | hash |
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203 octve_config_info | __octave_config_info__ |
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204 onenormest | normest1 |
20923
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Unified "sleep" functions to "octave_sleep" in C++ and "pause" in Octave.
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205 sleep | pause |
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206 usleep | pause |
20484 | 207 wavread | audioread |
208 wavwrite | audiowrite | |
209 | |
210 ** The following functions were deprecated in Octave 3.8 and have been | |
211 removed from Octave 4.2. | |
212 | |
213 default_save_options java_new | |
214 gen_doc_cache java_unsigned_conversion | |
215 interp1q javafields | |
216 isequalwithequalnans javamethods | |
217 java_convert_matrix re_read_readline_init_file | |
218 java_debug read_readline_init_file | |
219 java_invoke saving_history | |
220 | |
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221 ** The global error_state variable in Octave's C++ API has been |
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222 deprecated and will be removed in a future version. Now the error |
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223 and print_usage functions throw an exception |
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224 (octave::execution_exception) after displaying the error message. |
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225 This makes the error and print_usage functions in C++ work more like |
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226 the corresponding functions in the scripting language. |
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227 |
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228 ** The default error handlers in liboctave have been updated to use |
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229 exceptions. After displaying an error message they no longer return |
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230 control to the calling program. The error handler function can be |
21133
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231 customized through the global variables |
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232 "current_liboctave_error_handler" and |
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233 "current_liboctave_error_with_id_handler". If a programmer has |
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234 installed their own custom error handling routines when directly |
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235 linking with liboctave then these must be updated to throw an |
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236 exception and not return to the calling program. |
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237 |
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238 ** The system for common errors and warnings has been renamed from |
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239 gripe_XXX to either err_XXX if error is called or warn_XXX if |
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240 warning is called. The gripe_XXX functions are deprecated and will |
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241 be removed in version 4.6. |
21101 | 242 |
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243 ** New configure option, --enable-address-sanitizer-flags, to build |
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244 Octave with memory allocator checks (similar to those in valgrind) |
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245 built in. |
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eliminate more uses of error state
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246 |
19645
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update default branch to release as 4.0
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247 Summary of important user-visible changes for version 4.0: |
18110
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248 --------------------------------------------------------- |
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249 |
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250 ** A graphical user interface is now the default when running Octave |
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251 interactively. The start-up option --no-gui will run the familiar |
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252 command line interface, and still allows use of the GUI dialogs and |
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253 qt plotting toolkit. The option --no-gui-libs runs a minimalist |
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254 command line interface that does not link with the Qt libraries and |
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255 uses the fltk toolkit for plotting. |
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256 |
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257 ** Octave now uses OpenGL graphics with Qt widgets by default. If |
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258 OpenGL libraries are not available when Octave is built, gnuplot is |
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259 used. You may choose to use the fltk or gnuplot toolkit for |
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260 graphics by executing the command |
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261 |
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262 graphics_toolkit ("fltk") |
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263 OR |
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264 graphics_toolkit ("gnuplot") |
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265 |
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266 Adding such a command to your ~/.octaverc file will set the default |
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267 for each session. |
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268 |
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269 ** A new syntax for object oriented programming termed classdef has |
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270 been introduced. See the manual for more extensive documentation of |
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271 the classdef interface. |
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273 New keywords: |
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274 |
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275 classdef endclassdef |
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276 enumeration endenumeration |
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277 events endevents |
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278 methods endmethods |
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279 properties endproperties |
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280 |
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281 ** New audio functions and classes: |
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282 |
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283 audiodevinfo audioread sound |
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284 audioinfo audiorecorder soundsc |
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285 audioplayer audiowrite |
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286 |
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287 ** Other new classes in Octave 4.0: |
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288 |
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289 audioplayer inputParser |
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290 audiorecorder |
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291 |
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292 ** Optional stricter Matlab compatibility for ranges, diagonal |
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293 matrices, and permutation matrices. |
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294 |
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295 Octave has internal optimizations which use space-efficient storage |
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296 for the three data types above. Three new functions have been added |
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297 which control whether the optimizations are used (default), or |
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298 whether the data types are stored as full matrices. |
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299 |
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300 disable_range disable_diagonal_matrix disable_permutation_matrix |
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301 |
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302 All three optimizations are disabled if Octave is started with the |
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303 --braindead command line option. |
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304 |
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305 ** The preference |
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306 |
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307 do_braindead_shortcircuit_evaluation |
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308 |
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309 is now enabled by default. |
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310 |
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311 ** The preference |
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312 |
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313 allow_noninteger_range_as_index |
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314 |
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315 is now enabled by default and the warning ID |
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316 |
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317 Octave:noninteger-range-as-index |
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318 |
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319 is now set to "on" by default instead of "error" by default and "on" |
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320 for --traditional. |
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321 |
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322 ** The "backtrace" warning option is now enabled by default. This |
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323 change was made for Matlab compatibility. |
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324 |
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325 ** For compatibility with Matlab, the "ismatrix (x)" function now only |
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326 checks the dimension of "x". The old behavior of "ismatrix" is |
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327 obtained by "isnumeric (x) || islogical (x) || ischar (x)". |
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328 |
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329 ** The nextpow2 function behavior has been changed for vector inputs. |
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330 Instead of computing `nextpow2 (length (x))', it will now compute |
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331 nextpow2 for each element of the input. This change is Matlab |
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332 compatible, and also prevents bugs for "vectors" of length 1. |
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333 |
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334 ** polyeig now returns a row vector of eigenvalues rather than a matrix |
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335 with the eigenvalues on the diagonal. This change was made for |
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336 Matlab compatibility. |
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337 |
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338 ** Interpolation function changes for Matlab compatibility |
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339 |
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340 The interpolation method 'cubic' is now equivalent to 'pchip' for |
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341 interp1, interp2, and interp3. Previously, 'cubic' was equivalent |
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342 to 'spline' for interp2. This may produce different results as |
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343 'spline' has continuous 1st and 2nd derivatives while 'pchip' only |
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344 has a continuous 1st derivative. The methods 'next' and 'previous' |
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345 have been added to interp1 for compatibility. |
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346 |
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347 ** The delaunay function has been extended to accept 3-D inputs for |
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348 Matlab compatibility. The delaunay function no longer plots the |
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349 triangulation if no output argument is requested, instead, the |
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350 triangulation is always returned. The delaunay3 function which |
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351 handles 3-D inputs has been deprecated in favor of delaunay. |
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352 |
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353 ** The trigonometric functions asin and acos return different phase |
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354 values from previous versions of Octave when the input is outside |
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355 the principal branch ([-1, 1]). If the real portion of the input is |
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356 greater than 1 then the limit from below is taken. If the real |
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357 portion is less than 1 then the limit from above is taken. This |
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358 criteria is consistent with several other numerical analysis |
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359 software packages. |
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360 |
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361 ** The hyperbolic function acosh now returns values with a phase in the |
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362 range [-pi/2, +pi/2]. Previously Octave returned values in the |
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363 range [0, pi]. This is consistent with several other numerical |
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364 analysis software packages. |
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365 |
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366 ** strfind changes when using empty pattern ("") for Matlab |
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367 compatibility |
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368 |
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369 strfind now returns an empty array when the pattern itself is empty. |
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370 In previous versions of Octave, strfind matched at every character |
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371 location when the pattern was empty. |
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372 |
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373 NEW |
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374 strfind ("abc", "") => [] |
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375 OLD |
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376 strfind ("abc", "") => [1, 2, 3, 4] |
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377 |
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378 ** Integer formats used in the printf family of functions now work for |
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379 64-bit integers and are more compatible with Matlab when printing |
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380 non-integer values. Now instead of truncating, Octave will switch |
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381 the effective format to '%g' in the following circumstances: |
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382 |
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383 * the value of an integer type (int8, uint32, etc.) value exceeds |
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384 the maximum for the format specifier. For '%d', the limit is |
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385 intmax ('int64') and for '%u' it is intmax ('uint64'). |
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386 |
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387 * round(x) != x or the value is outside the range allowed by the |
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388 integer format specifier. |
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389 |
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390 There is still one difference: Matlab switches to '%e' and Octave |
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391 switches to '%g'. |
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392 |
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Return a column vector by default for Matlab compatibility (bug #44425, bug #44453).
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393 ** The functions intersect, setdiff, setxor, and union now return a |
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394 column vector as output unless the input was a row vector. This |
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395 change was made for Matlab compatibility. |
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396 |
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397 ** The inpolygon function now returns true for points that are within |
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398 the polygon OR on it's edge. This change was made for Matlab |
20715
5b7643257978
Remove trailing whitespace at end of lines.
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399 compatibility. |
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400 |
19258
a4e993343e93
Overhaul the archive family (bzip2, gzip, zip, tar) of m-files.
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401 ** The archive family of functions (bzip2, gzip, zip, tar) and their |
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402 unpacking routines (bunzip2, gunzip, unzip, untar, unpack) have been |
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403 recoded. Excepting unpack, the default is now to place files in the |
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404 same directory as the archive (on unpack) or as the original files |
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405 (on archiving). |
19258
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406 |
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407 ** Qt and FLTK graphics toolkits now support offscreen rendering on |
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408 Linux. In other words, print will work even when the figure |
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409 visibility is "off". |
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410 |
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411 ** Z-order stacking issues with patches, grid lines, and line object |
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412 plot markers for on screen display and printing have all been |
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413 resolved. For 2-D plots the axis grid lines can be placed on top of |
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414 the plot with set (gca, "layer", "top"). |
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|
415 |
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416 ** The patch graphic object has been overhauled. It now produces |
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417 visual results equivalent to Matlab even for esoteric combinations |
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418 of faces/vertices/cdata. |
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|
419 |
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420 ** The polar() plot function now draws a circular theta axis and radial |
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421 rho axis rather than using a rectangular x/y axis. |
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|
422 |
18723
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linkprop.m: Overhaul function for performance and Matlab compatibility.
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423 ** linkprop has been completely re-coded for performance and Matlab |
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424 compatibility. It now returns a linkprop object which must be |
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425 stored in a variable for as long as the graphic objects should |
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426 remain linked. To unlink properties use 'clear hlink' where hlink |
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427 is the variable containing the linkprop object. |
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|
428 |
19051
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429 ** isprime has been extended to operate on negative and complex inputs. |
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430 |
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431 ** xor has been extended to accept more than two arguments in which |
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432 case it performs cumulative XOR reduction. |
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NEWS: Announce addition of XOR reduction to xor function.
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433 |
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Deprecate delaunay3 and extend delaunay to 3-D inputs.
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434 ** The following functions now support N-dimensional arrays: |
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|
435 |
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rectint: fix for non-overlapping rectangle, and support ND boxes (bug #44904)
Carnë Draug <carandraug@octave.org>
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|
436 fliplr flipud rot90 rectint |
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|
437 |
19030
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438 ** The new warning ID "Octave:data-file-in-path" replaces the three |
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439 previous separate warning IDs "Octave:fopen-file-in-path", |
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440 "Octave:load-file-in-path", and "Octave:md5sum-file-in-path". |
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441 |
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442 ** The warning ID Octave:singular-matrix-div has been replaced by |
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443 Octave:nearly-singular-matrix and Octave:singular-matrix. |
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444 |
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445 ** The warning ID Octave:matlab-incompatible has been replaced by |
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446 Octave:language-extension to better reflect its meaning. |
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447 |
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448 ** The warning ID Octave:broadcast has been removed. Instead automatic |
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449 broadcasting will throw an Octave:language-extension warning. This |
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450 warning ID is used for broadcasting as well as other features not |
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451 available in Matlab. |
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|
452 |
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453 ** Other new functions added in 4.0: |
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454 |
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Add the annotation function (bug #43282)
Pantxo Diribarne <pantxo.diribarne@gmail.com>
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455 annotation |
19081 | 456 bandwidth |
19530
5ab6fcf32d1e
New function for colormap cubehelix.
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19520
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457 cubehelix |
19081 | 458 dir_in_loadpath |
19126
995df67fc912
Flip arrays - ND support for fliplr and flipud, and replace flipdim with flip.
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459 flip |
19313
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New functions im2frame and frame2im.
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|
460 frame2im |
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Document get_home_directory in Octave manual and NEWS file.
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461 get_home_directory |
19081 | 462 hgload |
463 hgsave | |
464 ichol | |
465 ilu | |
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|
466 im2frame |
19081 | 467 isbanded |
468 isdiag | |
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469 isstudent |
19081 | 470 istril |
471 istriu | |
472 javachk | |
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|
473 jit_failcnt |
19081 | 474 linkaxes |
475 lscov | |
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476 metaclass |
19081 | 477 numfields |
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|
478 open |
19747
56157a7505ed
Add new ordschur function.
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|
479 ordschur |
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|
480 pan |
19354
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New function qmr (patch #8569).
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19313
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|
481 qmr |
19081 | 482 rotate |
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|
483 rotate3d |
19081 | 484 sylvester |
19167
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Add new function unsetenv from gnulib to Octave.
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|
485 unsetenv |
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486 validateattributes |
19089 | 487 zoom |
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|
488 |
19122
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|
489 ** inline() scheduled for eventual deprecation by Matlab |
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|
490 |
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491 Functions created through the use of inline are scheduled for |
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492 deprecation by Matlab. When this occurs Octave will continue to |
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493 support inline functions for an indeterminate amount of time before |
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494 also removing support. All new code should use anonymous functions |
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495 in place of inline functions. |
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|
496 |
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497 ** Deprecated functions. |
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498 |
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499 The following functions have been deprecated in Octave 4.0 and will |
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500 be removed from Octave 4.4 (or whatever version is the second major |
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501 release after 4.0): |
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502 |
19268 | 503 Function | Replacement |
504 ---------------------|------------------ | |
505 bicubic | interp2 | |
506 delaunay3 | delaunay | |
507 dump_prefs | individual preference get/set routines | |
508 find_dir_in_path | dir_in_loadpath | |
509 finite | isfinite | |
510 fmod | rem | |
511 fnmatch | glob or regexp | |
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512 gmap40 | ---- |
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513 loadaudio | audioread |
19268 | 514 luinc | ilu or ichol |
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515 mouse_wheel_zoom | mousewheelzoom axes property |
19268 | 516 nfields | numfields |
517 octave_tmp_file_name | tempname | |
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518 playaudio | audioplayer |
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519 saveaudio | audiowrite |
19268 | 520 syl | sylvester |
521 usage | print_usage | |
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522 |
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523 allow_noninteger_range_as_index |
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524 do_braindead_shortcircuit_evaluation |
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525 setaudio |
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526 |
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527 ** The following functions were deprecated in Octave 3.8 and will be |
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528 removed from Octave 4.2 (or whatever version is the second major |
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529 release after 3.8): |
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530 |
19081 | 531 default_save_options java_new |
532 gen_doc_cache java_unsigned_conversion | |
533 interp1q javafields | |
534 isequalwithequalnans javamethods | |
18911 | 535 java_convert_matrix re_read_readline_init_file |
19081 | 536 java_debug read_readline_init_file |
537 java_invoke saving_history | |
538 | |
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539 ** The following functions were deprecated in Octave 3.6 and have been |
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540 removed from Octave 4.0. |
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541 |
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542 cut polyderiv |
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543 cor shell_cmd |
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544 corrcoef studentize |
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545 __error_text__ sylvester_matrix |
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546 error_text |
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547 |
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548 ** The following keywords were deprecated in Octave 3.8 and have been |
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549 removed from Octave 4.0 |
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550 |
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551 static |
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552 |
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553 ** The following configuration variables were deprecated in Octave 3.8 |
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554 and have been removed from Octave 4.0 |
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555 |
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556 CC_VERSION (now GCC_VERSION) |
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557 CXX_VERSION (now GXX_VERSION) |
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558 |
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559 ** The internal function atan2 of the sparse matrix class has been |
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560 deprecated in Octave 4.0 and will be removed from Octave 4.4 (or |
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561 whatever version is the second major release after 4.0). Use the |
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562 Fatan2 function with sparse inputs as a replacement. |
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563 |
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564 ** The internal class Octave_map was deprecated in Octave 3.8 and has |
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565 been removed from Octave 4.0. Replacement classes are octave_map |
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566 (struct array) or octave_scalar_map for a single structure. |
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567 |
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568 ** The configure option --enable-octave-allocator has been removed. |
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569 The internal class octave_allocator declared in oct-alloc.h has been |
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570 removed. The header remains, but is deprecated. The macros to |
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571 access the class (DECLARE_OCTAVE_ALLOCATOR, DEFINE_OCTAVE_ALLOCATOR, |
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572 and DEFINE_OCTAVE_ALLOCATOR2) are now unconditionally defined to be |
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573 empty. |
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574 |
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575 ** Octave now has OpenMP enabled by default if the system provides a |
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576 working OpenMP implementation. This allows oct-file modules to take |
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577 advantage of OpenMP if desired. This can be disabled when building |
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578 Octave with the configure option --disable-openmp. |
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579 |
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580 ** Octave now automatically truncates intermediate calculations done |
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581 with floating point values to 64 bits. Some hardware math |
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582 co-processors, such as the x87, maintain extra precision, but this |
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583 leads to disagreements in calculations when compared to reference |
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584 implementations in software using the IEEE standard for double |
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585 precision. There was no measurable performance impact to this |
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586 change, but it may be disabled with the configure option |
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587 --disable-float-truncate. MinGW and Cygwin platforms, as well as |
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588 GCC compilers >= 5.0 require this feature. Non-x87 hardware, or |
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589 hardware using SSE options exclusively, can disable float truncation |
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590 if desired. |
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591 |
9352 | 592 --------------------------------------------------------- |
593 | |
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594 See NEWS.3 for old news. |