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Merged closed branch "kai" into default.
author Kai T. Ohlhus <k.ohlhus@gmail.com>
date Tue, 01 Nov 2016 01:06:10 +0100
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94
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1 <!doctype html public "-//IETF//DTD HTML Strict//EN">
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2 <html>
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3 <head>
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4 <title>Notable Changes in Octave version 3</title>
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5 <link rel="stylesheet" type="text/css" href="octave.css" />
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6 </head>
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7
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8 <body>
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9 <div id="title"><h1>News for Octave Version 3</h1></div>
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10
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11 <ul>
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12 <li>Compatibility with Matlab graphics is much better. We now
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13 have some graphics features that work like Matlab's Handle
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14 Graphics (tm):
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15 <ul>
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16 <li> You can make a subplot and then use the print function to
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17 generate file with the plot.</li>
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18
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19 <li> RGB line colors are supported if you use gnuplot 4.2. Octave
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20 can still use gnuplot 4.0, but there is no way to set arbitrary
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21 line colors with it when using the Matlab-style plot functions.
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22 There never was any way to do this reliably with older versions
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23 of gnuplot (whether run from Octave or not) since it only
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24 provided a limited set to choose from, and they were terminal
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25 dependent, so choosing color 1 with the X11 terminal would be
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26 different from color 1 with the PostScript terminal. Valid RGB
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27 colors for gnuplot 4.0 are the eight possible combinations of 0
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28 and 1 for the R, G and B values. Invalid values are all mapped
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29 to the same color.
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30 <p>
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31 This also affects patch objects used in the bar, countour, meshc
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32 and surfc functions, where the bars and contours will be
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33 monochrome. A workaround for this is to type "colormap gmap40"
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34 that loads a colormap that in many cases will be adequate for
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35 simple bar and contour plots.</li>
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36
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37 <li> You can control the width of lines using (for example):
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38 <pre>
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39 line (x, y, "linewidth", 4, "color", [1, 0, 0.5]);
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40 </pre>
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41 (this also shows the color feature).</li>
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42
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43 <li> With gnuplot 4.2, image data is plotted with gnuplot and may be
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44 combined with other 2-d plot data.</li>
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45
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46 <li> Lines for contour plots are generated with an Octave function, so
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47 contour plots are now 2-d plots instead of special 3-d plots, and
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48 this allows you to plot additional 2-d data on top of a contour
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49 plot.</li>
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50
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51 <li> With the gnuplot "extended" terminals the TeX interpreter is
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52 emulated. However, this means that the TeX interpreter is only
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53 supported on the postscript terminals with gnuplot 4.0. Under
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54 gnuplot 4.2 the terminals aqua, dumb, png, jpeg, gif, pm, windows,
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55 wxt, svg and x11 are supported as well.</li>
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56
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57 <li> The following plot commands are now considered obsolete and will
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58 be removed from a future version of Octave:
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59 <pre>
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60 __gnuplot_set__
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61 __gnuplot_show__
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62 __gnuplot_plot__
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63 __gnuplot_splot__
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64 __gnuplot_replot__
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65 </pre>
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66 Additionally, these functions no longer have any effect on plots
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67 created with the Matlab-style plot commands
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68 (<tt>plot</tt>, <tt>line</tt>, <tt>mesh</tt>, <tt>semilogx</tt>,
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69 etc.).
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70
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71 <li> Plot property values are not extensively checked. Specifying
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72 invalid property values may produce unpredictible results.</li>
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73
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74 <li> Octave now sends data over the same pipe that is used to send
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75 commands to gnuplot. While this avoids the problem of
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76 cluttering /tmp with data files, it is no longer possible to use
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77 the mouse to zoom in on plots. This is a limitation of gnuplot,
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78 which is unable to zoom when the data it plots is not stored in
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79 a file. Some work has been done to fix this problem in newer
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80 versions of gnuplot (> 4.2.2). See for example,
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81 <a href="http://www.nabble.com/zooming-of-inline-data-tf4357017.html#a12416496">this thread</a> on the gnuplot development list.
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82 </ul></li>
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83
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84
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85 <li>The way Octave handles search paths has changed. Instead of
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86 setting the built-in variable <tt>LOADPATH</tt>, you must
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87 use <tt>addpath</tt>, <tt>rmpath</tt>, or <tt>path</tt> to
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88 manipulate the function search path. These functions will
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89 maintain <tt>"."</tt> at the head of the path, for compatibility
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90 with Matlab.
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91 <p>
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92 Leading, trailing or doubled colons are no longer special.
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93 Now, all elements of the search path are explicitly included in
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94 the path when Octave starts. To display the path, use
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95 the <tt>path</tt> function.
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96 <p>
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97 Path elements that end in <tt>//</tt> are no longer searched recursively.
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98 Instead, you may use addpath and the genpath function to add an
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99 entire directory tree to the path. For example,
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100 <pre>
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101 addpath (genpath ("~/octave"));
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102 </pre>
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103 will add ~/octave and all directories below it to the head of the
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104 path.</li>
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105
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106
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107 <li>Previous versions of Octave had a number of built-in variables to
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108 control warnings (for example, <tt>warn_divide_by_zero</tt>). These
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109 variables have been replaced by warning identifiers that are used
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110 with the warning function to control the state of warnings.
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111 <p>
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112 For example, instead of writing
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113 <pre>
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114 warn_divide_by_zero = false;
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115 </pre>
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116 to disable divide-by-zero warnings, you should write
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117 <pre>
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118 warning ("off", "Octave:divide-by-zero");
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119 </pre>
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120 You may use the same technique in your own code to control
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121 warnings. For example, you can use
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122 <pre>
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123 warning ("My-package:phase-of-the-moon",
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124 "the phase of the moon could cause trouble today");
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125 </pre>
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126 to allow users to control this warning using the
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127 <tt>"My-package:phase-of-the-moon"</tt> warning identifier.
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128 <p>
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129 You may also enable or disable all warnings, or turn them into
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130 errors:
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131 <pre>
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132 warning ("on", "all");
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133 warning ("off", "all");
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134 warning ("error", "Octave:divide-by-zero");
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135 warning ("error", "all");
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136 </pre>
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137 You can query the state of current warnings using
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138 <pre>
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139 warning ("query", ID)
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140 warning ("query")
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141 </pre>
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142 (only those warning IDs which have been explicitly set are
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143 returned).
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144 <p>
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145 A partial list and description of warning identifiers is available
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146 using
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147 <pre>
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148 help warning_ids
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149 </pre></li>
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150
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151
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152 <li>All built-in variables have been converted to functions. This
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153 change simplifies the interpreter and allows a consistent
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154 interface to internal variables for user-defined packages and the
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155 core functions distributed with Octave. In most cases, code that
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156 simply accesses internal variables does not need to change. Code
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157 that sets internal variables will change. For example, instead of
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158 writing
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159 <pre>
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160 PS1 = ">> ";
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161 </pre>
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162 you will need to write
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163 <pre>
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164 PS1 (">> ");
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165 </pre>
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166 If you need write code that will run in both old and new versions
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167 of Octave, you can use something like
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168 <pre>
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169 if (exist ("OCTAVE_VERSION") == 5)
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170 ## New:
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171 PS1 (">> ");
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172 else
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173 ## Old:
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174 PS1 = ">> ";
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175 endif
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176 </pre></li>
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177
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178
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179 <li>For compatibility with Matlab, the output order of Octave's
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180 <tt>"system"</tt> function has changed from
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181 <pre>
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182 [output, status] = system (cmd);
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183 </pre>
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184 to
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185 <pre>
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186 [status, output] = system (cmd);
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187 </pre></li>
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188
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189
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190 <li>For compatibility with Matlab, <tt>normcdf</tt>, <tt>norminv</tt>,
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191 <tt>normpdf</tt>, and <tt>normrnd</tt> have been modified to
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192 compute distributions using the standard deviation instead of the
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193 variance.</li>
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194
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195
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196 <li>For compatibility with Matlab, the output of Octave's fsolve
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197 function has been changed from
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198 <pre>
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199 [x, info, msg] = fsolve (...);
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200 </pre>
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201 to
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202 <pre>
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203 [x, fval, info] = fsolve (...);
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204 </pre></li>
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205
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206
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207 <li>For compatibility with Matlab, <tt>normcdf</tt>, <tt>norminv</tt>,
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208 <tt>normpdf</tt>, and <tt>normrnd</tt> have been modified to
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209 compute distributions using the standard deviation instead of the
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210 variance.</li>
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211
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212
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213 <li>For compatibility with
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214 Matlab, <tt>gamcdf</tt>, <tt>gaminv</tt>, <tt>gampdf</tt>,
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215 <tt>gamrnd</tt>, <tt>expcdf</tt>, <tt>expinv</tt>, <tt>exppdf</tt>
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216 and <tt>exprnd</tt> have been modified to compute the
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217 distributions using the standard scale factor rather than one over
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218 the scale factor.
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219 </ul>
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220
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221 </body>
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222 </html>