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1 --- |
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2 layout: page |
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3 title: GNU Octave Version 4.2 |
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4 menu: false |
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5 permalink: NEWS-4.2.html |
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6 --- |
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7 |
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8 ## Summary of important user-visible changes |
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9 |
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10 November 13, 2016 |
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11 |
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12 {% include release_news_select.md %} |
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13 |
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14 <pre> |
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15 ** The parser has been extended to accept, but ignore, underscore |
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16 characters in numbers. This facilitates writing more legible code |
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17 by using '_' as a thousands separator or to group nibbles into bytes |
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18 in hex constants. |
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19 |
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20 Examples: 1_000_000 == 1e6 or 0xDE_AD_BE_EF |
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21 |
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22 ** The parser has been extended to understand binary numbers which |
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23 begin with the prefix '0b' or '0B'. The value returned is Octave's |
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24 default numeric class of double, not at unsigned integer class. |
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25 Therefore numbers greater than flintmax, i.e., 2^53, will lose some |
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26 precision. |
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27 |
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28 Examples: 0b101 == 5 or 0B1100_0001 == 0xC1 |
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29 |
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30 ** gnuplot 4.4 is now the minimum version supported by Octave. |
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31 |
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32 ** The default set of colors used to plot lines has been updated to be |
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33 compatible with Matlab's new default color scheme. The line plot |
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34 color scheme can be set with the axes property "ColorOrder". |
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35 |
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36 ** The default colormap is now set to "viridis" which is also the |
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37 default colormap in matplotlib. This new colormap fixes some of the |
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38 main issues with the old default colormap "jet" such as its bad |
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39 "luminance profile" and is also more similar to Matlab's new default |
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40 colormap "parula". |
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41 |
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42 ** The colormap function no longer supports the input argument "list" |
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43 to show built-in colormaps. Use "help colormap" to find the |
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44 built-in colormaps. |
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45 |
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46 ** The graphics command "hold on" now ensures that each new plot added |
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47 to an existing plot has a different color or linestyle according to |
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48 the "ColorOrder" and/or "LineStyleOrder" properties. This is |
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49 equivalent to the old command "hold all" and was made for Matlab |
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50 compatibility. Existing code *may* produce differently colored |
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51 plots if it did not specify the color for a plot and relied on each |
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52 new plot having the default first color in the "ColorOrder" |
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53 property. |
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54 |
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55 ** When starting, Octave now looks in the function path for a file |
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56 startup.m and executes any commands found there. This change was |
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57 made to accommodate Matlab users. Octave has it's own configuration |
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58 system based on the file .octaverc which is preferred. |
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59 |
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60 ** Octal ('\NNN') and hex ('\xNN') escape sequences in single quoted |
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61 strings are now interpreted by the function do_string_escapes(). |
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62 The *printf family of functions now supports octal and hex escape |
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63 sequences in single-quoted strings for Matlab compatibility. |
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64 |
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65 ** Special octal and hex escape sequences for the pattern and |
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66 replacement strings in regular expressions are now interpreted for |
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67 Matlab compatibility. |
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68 |
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69 octal: '\oNNN' or '\o{NNN}' |
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70 hex : '\xNN' or '\x{NN}' |
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71 |
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72 ** Unknown escape sequences in the replacement string for regexprep are |
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73 now substituted with their unescaped version and no warning is |
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74 emitted. This change was made for Matlab compatibility. |
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75 |
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76 Example: regexprep ('a', 'a', 'x\yz') |
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77 => 'xyz' |
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78 |
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79 ** mkfifo now interprets the MODE argument as an octal, not decimal, |
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80 integer. This is consistent with the equivalent shell command. |
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81 |
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82 ** linspace now returns an empty matrix if the number of requested |
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83 points is 0 or a negative number. This change was made to be |
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84 compatible with Matlab releases newer than 2011. In addition, |
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85 Octave no longer supports matrix inputs for A or B. |
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86 |
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87 ** The cov function now returns the complex conjugate of the result |
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88 from previous versions of Octave. This change was made for |
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89 compatibility with Matlab. |
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90 |
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91 ** condest now works with a normest1 compatible syntax. |
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92 |
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93 ** The griddata function no longer plots the interpolated mesh if no |
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94 output argument is requested, instead the vector or array of |
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95 interpolated values is always returned for Matlab compatibility. |
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96 |
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97 ** The new function "light" and the corresponding graphics object |
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98 provide light and shadow effects for patch and surface objects. |
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99 |
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100 ** The surfnorm function now returns unnormalized (magnitude != 1) |
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101 normal vectors for compatibility with Matlab. |
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102 |
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103 ** The normal vectors returned from isonormals have been reversed to |
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104 point towards smaller values for compatibility with Matlab. |
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105 |
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106 ** The quadl function now uses an absolute, rather than relative, |
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107 tolerance for Matlab compatibility. The default tolerance is 1e-6 |
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108 which may result in lower precision results than previous versions |
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109 of Octave which used eps as the relative tolerance. The quadl |
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110 function has also been extended to return a second output with the |
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111 total number of function evaluations. |
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112 |
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113 ** The textscan function is now built-in and is much faster and much |
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114 more Matlab-compatible than the previous m-file version. |
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115 |
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116 ** Dialog boxes--errordlg, helpdlg, inputdlg, listdlg, msgbox, |
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117 questdlg, and warndlg--now exclusively use Qt for rendering. |
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118 Java based versions have been removed. |
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119 |
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120 ** The axes properties "TitleFontSizeMultiplier" and "TitleFontWeight" |
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121 are now implemented which control the default appearance of text |
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122 created with title(). |
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123 The axes property "LabelFontSizeMultiplier" is now implemented |
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124 which controls the default appearance of text created with |
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125 xlabel(), ylabel(), or zlabel(). |
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126 |
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127 ** The graphics property "box" for axes now defaults to "off". |
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128 To obtain equivalent plots to previous versions of Octave use |
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129 set (0, "DefaultAxesBox", "on"); |
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130 in your .octaverc file. |
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131 |
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132 ** The graphics property "boxstyle" has been implemented. The default |
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133 is "back" which draws only the back planes in a 3-D view. If the |
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134 option is "full" then all planes are drawn. |
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135 |
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136 ** The graphics property "erasemode" has been hidden, and will |
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137 eventually be removed. This property has also been removed |
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138 from Matlab, and was never implemented in Octave. |
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139 |
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140 ** The graphics property "graphicssmoothing" for figures now controls |
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141 whether anti-aliasing will be used for lines. The default is "on". |
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142 |
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143 ** The value "zero" for the axes properties "xaxislocation" and |
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144 "yaxislocation" has been deprecated and will be removed from |
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145 Octave 4.6. Use "origin" instead. |
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146 |
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147 ** The publish function allows easy publication of Octave script files |
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148 in HTML or other formats, including figures and output created by |
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149 this script. It comes with its counterpart grabcode, which lets one |
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150 literally grab the HTML published code from a remote website, for |
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151 example. |
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152 |
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153 ** The value of the MEX variable TrapFlag now defaults to 0, which will |
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154 cause Octave to abort execution of a MEX file and return to the |
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155 prompt if an error is encountered in mexCallMATLAB. |
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156 |
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157 ** The MEX API now includes the function mexCallMATLABWithTrap. This |
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158 function will not abort if an error occurs during mexCallMATLAB, but |
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159 instead will return execution to the MEX function for error |
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160 handling. |
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161 |
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162 ** The MEX API functions for input validation that begin with "mxIs" |
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163 (e.g., mxIsDouble, mxIsEmpty, etc.) now return type bool rather than |
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164 type int. |
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165 |
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166 ** The functions mxAssert and mxAssertS for checking assertions have |
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167 been added. In order to avoid a performance penalty they are only |
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168 compiled in to debug versions of a MEX file, i.e., that are produced |
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169 when the '-g' option is given to mex or mkoctfile. |
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170 |
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171 ** Other new MEX API functions include mexEvalStringWithTrap, |
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172 mxIsScalar, mxCreateUninitNumericArray, mxCreateUninitNumericMatrix. |
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173 |
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174 ** Other new functions added in 4.2: |
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175 |
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176 audioformats |
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177 camlight |
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178 condeig |
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179 deg2rad |
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180 dialog |
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181 evalc |
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182 hash |
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183 im2double |
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184 isocaps |
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185 lighting |
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186 localfunctions |
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187 material |
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188 normest1 |
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189 ode23 |
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190 ode45 |
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191 odeget |
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192 odeplot |
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193 odeset |
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194 padecoef |
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195 profexport |
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196 psi |
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197 rad2deg |
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198 reducepatch |
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199 reducevolume |
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200 smooth3 |
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201 uibuttongroup |
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202 |
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203 ** Deprecated functions. |
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204 |
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205 The following functions have been deprecated in Octave 4.2 and will |
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206 be removed from Octave 4.6 (or whatever version is the second major |
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207 release after 4.2): |
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208 |
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209 Function | Replacement |
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210 ---------------------|------------------ |
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211 bitmax | flintmax |
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212 mahalanobis | mahal in Octave-Forge statistics pkg |
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213 md5sum | hash |
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214 octve_config_info | __octave_config_info__ |
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215 onenormest | normest1 |
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216 sleep | pause |
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217 usleep | pause |
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218 wavread | audioread |
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219 wavwrite | audiowrite |
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220 |
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221 ** The following functions were deprecated in Octave 3.8 and have been |
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222 removed from Octave 4.2. |
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223 |
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224 default_save_options java_new |
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225 gen_doc_cache java_unsigned_conversion |
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226 interp1q javafields |
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227 isequalwithequalnans javamethods |
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228 java_convert_matrix re_read_readline_init_file |
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229 java_debug read_readline_init_file |
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230 java_invoke saving_history |
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231 |
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232 ** The global error_state variable in Octave's C++ API has been |
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233 deprecated and will be removed in a future version. Now the error |
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234 and print_usage functions throw an exception |
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235 (octave::execution_exception) after displaying the error message. |
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236 This makes the error and print_usage functions in C++ work more like |
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237 the corresponding functions in the scripting language. |
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238 |
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239 ** The default error handlers in liboctave have been updated to use |
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240 exceptions. After displaying an error message they no longer return |
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241 control to the calling program. The error handler function can be |
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242 customized through the global variables |
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243 "current_liboctave_error_handler" and |
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244 "current_liboctave_error_with_id_handler". If a programmer has |
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245 installed their own custom error handling routines when directly |
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246 linking with liboctave then these must be updated to throw an |
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247 exception and not return to the calling program. |
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248 |
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249 ** The system for common errors and warnings has been renamed from |
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250 gripe_XXX to either err_XXX if error is called or warn_XXX if |
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251 warning is called. The gripe_XXX functions are deprecated and will |
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252 be removed in version 4.6. |
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253 |
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254 ** New configure option, --enable-address-sanitizer-flags, to build |
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255 Octave with memory allocator checks (similar to those in valgrind) |
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256 built in. |
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257 </pre> |
