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Add release notes for Octave 4.2.
author Kai T. Ohlhus <k.ohlhus@gmail.com>
date Tue, 15 Nov 2016 19:26:33 +0100
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1 ---
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2 layout: default
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3 ---
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4
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5 <pre>
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7
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8 Summary of important user-visible changes for version 4.2:
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9 ---------------------------------------------------------
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11 ** The parser has been extended to accept, but ignore, underscore
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12 characters in numbers. This facilitates writing more legible code
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13 by using '_' as a thousands separator or to group nibbles into bytes
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14 in hex constants.
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15
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16 Examples: 1_000_000 == 1e6 or 0xDE_AD_BE_EF
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17
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18 ** The parser has been extended to understand binary numbers which
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19 begin with the prefix '0b' or '0B'. The value returned is Octave's
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20 default numeric class of double, not at unsigned integer class.
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21 Therefore numbers greater than flintmax, i.e., 2^53, will lose some
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22 precision.
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23
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24 Examples: 0b101 == 5 or 0B1100_0001 == 0xC1
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25
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26 ** gnuplot 4.4 is now the minimum version supported by Octave.
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27
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28 ** The default set of colors used to plot lines has been updated to be
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29 compatible with Matlab's new default color scheme. The line plot
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30 color scheme can be set with the axes property "ColorOrder".
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31
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32 ** The default colormap is now set to "viridis" which is also the
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33 default colormap in matplotlib. This new colormap fixes some of the
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34 main issues with the old default colormap "jet" such as its bad
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35 "luminance profile" and is also more similar to Matlab's new default
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36 colormap "parula".
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37
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38 ** The colormap function no longer supports the input argument "list"
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39 to show built-in colormaps. Use "help colormap" to find the
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40 built-in colormaps.
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41
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42 ** The graphics command "hold on" now ensures that each new plot added
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43 to an existing plot has a different color or linestyle according to
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44 the "ColorOrder" and/or "LineStyleOrder" properties. This is
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45 equivalent to the old command "hold all" and was made for Matlab
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46 compatibility. Existing code *may* produce differently colored
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47 plots if it did not specify the color for a plot and relied on each
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48 new plot having the default first color in the "ColorOrder"
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49 property.
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50
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51 ** When starting, Octave now looks in the function path for a file
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52 startup.m and executes any commands found there. This change was
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53 made to accommodate Matlab users. Octave has it's own configuration
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54 system based on the file .octaverc which is preferred.
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55
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56 ** Octal ('\NNN') and hex ('\xNN') escape sequences in single quoted
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57 strings are now interpreted by the function do_string_escapes().
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58 The *printf family of functions now supports octal and hex escape
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59 sequences in single-quoted strings for Matlab compatibility.
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60
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61 ** Special octal and hex escape sequences for the pattern and
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62 replacement strings in regular expressions are now interpreted for
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63 Matlab compatibility.
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64
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65 octal: '\oNNN' or '\o{NNN}'
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66 hex : '\xNN' or '\x{NN}'
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67
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68 ** Unknown escape sequences in the replacement string for regexprep are
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69 now substituted with their unescaped version and no warning is
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70 emitted. This change was made for Matlab compatibility.
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71
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72 Example: regexprep ('a', 'a', 'x\yz')
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73 => 'xyz'
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74
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75 ** mkfifo now interprets the MODE argument as an octal, not decimal,
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76 integer. This is consistent with the equivalent shell command.
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77
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78 ** linspace now returns an empty matrix if the number of requested
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79 points is 0 or a negative number. This change was made to be
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80 compatible with Matlab releases newer than 2011. In addition,
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81 Octave no longer supports matrix inputs for A or B.
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82
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83 ** The cov function now returns the complex conjugate of the result
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84 from previous versions of Octave. This change was made for
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85 compatibility with Matlab.
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86
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87 ** condest now works with a normest1 compatible syntax.
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88
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89 ** The griddata function no longer plots the interpolated mesh if no
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90 output argument is requested, instead the vector or array of
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91 interpolated values is always returned for Matlab compatibility.
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92
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93 ** The new function "light" and the corresponding graphics object
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94 provide light and shadow effects for patch and surface objects.
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95
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96 ** The surfnorm function now returns unnormalized (magnitude != 1)
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97 normal vectors for compatibility with Matlab.
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98
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99 ** The normal vectors returned from isonormals have been reversed to
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100 point towards smaller values for compatibility with Matlab.
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101
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102 ** The quadl function now uses an absolute, rather than relative,
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103 tolerance for Matlab compatibility. The default tolerance is 1e-6
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104 which may result in lower precision results than previous versions
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105 of Octave which used eps as the relative tolerance. The quadl
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106 function has also been extended to return a second output with the
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107 total number of function evaluations.
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108
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109 ** The textscan function is now built-in and is much faster and much
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110 more Matlab-compatible than the previous m-file version.
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111
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112 ** Dialog boxes--errordlg, helpdlg, inputdlg, listdlg, msgbox,
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113 questdlg, and warndlg--now exclusively use Qt for rendering.
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114 Java based versions have been removed.
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115
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116 ** The axes properties "TitleFontSizeMultiplier" and "TitleFontWeight"
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117 are now implemented which control the default appearance of text
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118 created with title().
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119 The axes property "LabelFontSizeMultiplier" is now implemented
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120 which controls the default appearance of text created with
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121 xlabel(), ylabel(), or zlabel().
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122
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123 ** The graphics property "box" for axes now defaults to "off".
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124 To obtain equivalent plots to previous versions of Octave use
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125 set (0, "DefaultAxesBox", "on");
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126 in your .octaverc file.
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127
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128 ** The graphics property "boxstyle" has been implemented. The default
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129 is "back" which draws only the back planes in a 3-D view. If the
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130 option is "full" then all planes are drawn.
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131
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132 ** The graphics property "erasemode" has been hidden, and will
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133 eventually be removed. This property has also been removed
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134 from Matlab, and was never implemented in Octave.
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135
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136 ** The graphics property "graphicssmoothing" for figures now controls
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137 whether anti-aliasing will be used for lines. The default is "on".
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138
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139 ** The value "zero" for the axes properties "xaxislocation" and
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140 "yaxislocation" has been deprecated and will be removed from
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141 Octave 4.6. Use "origin" instead.
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142
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143 ** The publish function allows easy publication of Octave script files
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144 in HTML or other formats, including figures and output created by
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145 this script. It comes with its counterpart grabcode, which lets one
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146 literally grab the HTML published code from a remote website, for
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147 example.
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148
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149 ** The value of the MEX variable TrapFlag now defaults to 0, which will
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150 cause Octave to abort execution of a MEX file and return to the
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151 prompt if an error is encountered in mexCallMATLAB.
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152
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153 ** The MEX API now includes the function mexCallMATLABWithTrap. This
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154 function will not abort if an error occurs during mexCallMATLAB, but
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155 instead will return execution to the MEX function for error
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156 handling.
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157
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158 ** The MEX API functions for input validation that begin with "mxIs"
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159 (e.g., mxIsDouble, mxIsEmpty, etc.) now return type bool rather than
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160 type int.
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161
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162 ** The functions mxAssert and mxAssertS for checking assertions have
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163 been added. In order to avoid a performance penalty they are only
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164 compiled in to debug versions of a MEX file, i.e., that are produced
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165 when the '-g' option is given to mex or mkoctfile.
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166
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167 ** Other new MEX API functions include mexEvalStringWithTrap,
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168 mxIsScalar, mxCreateUninitNumericArray, mxCreateUninitNumericMatrix.
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169
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170 ** Other new functions added in 4.2:
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171
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172 audioformats
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173 camlight
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174 condeig
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175 deg2rad
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176 dialog
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177 evalc
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178 hash
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179 im2double
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180 isocaps
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181 lighting
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182 localfunctions
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183 material
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184 normest1
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185 ode23
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186 ode45
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187 odeget
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188 odeplot
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189 odeset
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190 padecoef
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191 profexport
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192 psi
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193 rad2deg
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194 reducepatch
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195 reducevolume
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196 smooth3
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197 uibuttongroup
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198
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199 ** Deprecated functions.
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200
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201 The following functions have been deprecated in Octave 4.2 and will
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202 be removed from Octave 4.6 (or whatever version is the second major
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203 release after 4.2):
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204
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205 Function | Replacement
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206 ---------------------|------------------
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207 bitmax | flintmax
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208 mahalanobis | mahal in Octave-Forge statistics pkg
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209 md5sum | hash
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210 octve_config_info | __octave_config_info__
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211 onenormest | normest1
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212 sleep | pause
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213 usleep | pause
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214 wavread | audioread
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215 wavwrite | audiowrite
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216
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217 ** The following functions were deprecated in Octave 3.8 and have been
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218 removed from Octave 4.2.
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219
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220 default_save_options java_new
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221 gen_doc_cache java_unsigned_conversion
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222 interp1q javafields
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223 isequalwithequalnans javamethods
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224 java_convert_matrix re_read_readline_init_file
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225 java_debug read_readline_init_file
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226 java_invoke saving_history
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227
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228 ** The global error_state variable in Octave's C++ API has been
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229 deprecated and will be removed in a future version. Now the error
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230 and print_usage functions throw an exception
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231 (octave::execution_exception) after displaying the error message.
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232 This makes the error and print_usage functions in C++ work more like
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233 the corresponding functions in the scripting language.
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234
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235 ** The default error handlers in liboctave have been updated to use
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236 exceptions. After displaying an error message they no longer return
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237 control to the calling program. The error handler function can be
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238 customized through the global variables
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239 "current_liboctave_error_handler" and
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240 "current_liboctave_error_with_id_handler". If a programmer has
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241 installed their own custom error handling routines when directly
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242 linking with liboctave then these must be updated to throw an
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243 exception and not return to the calling program.
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244
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245 ** The system for common errors and warnings has been renamed from
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246 gripe_XXX to either err_XXX if error is called or warn_XXX if
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247 warning is called. The gripe_XXX functions are deprecated and will
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248 be removed in version 4.6.
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249
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250 ** New configure option, --enable-address-sanitizer-flags, to build
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251 Octave with memory allocator checks (similar to those in valgrind)
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252 built in.
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253 </pre>