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annotate pages/NEWS-3.md @ 271:3ce19581b946
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| author | Kai Torben Ohlhus <k.ohlhus@gmail.com> |
|---|---|
| date | Mon, 21 Feb 2022 17:32:38 +0900 |
| parents | e69093ab4992 |
| children |
| rev | line source |
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| 215 | 1 --- |
| 2 layout: page | |
| 3 title: GNU Octave Version 3 | |
| 4 permalink: NEWS-3.html | |
| 5 --- | |
| 6 | |
| 7 ## Summary of important user-visible changes | |
| 8 | |
| 9 December 21, 2007 | |
| 10 | |
| 11 {% include release_news_select.md %} | |
| 12 | |
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13 {::options parse_block_html="true" /} |
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14 <div class="panel callout"> |
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15 * TOC |
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16 {:toc} |
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17 </div> |
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18 {::options parse_block_html="false" /} |
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19 |
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20 |
| 215 | 21 <ul> |
| 22 <li>Compatibility with Matlab graphics is much better. We now | |
| 23 have some graphics features that work like Matlab's Handle | |
| 24 Graphics (tm): | |
| 25 <ul> | |
| 26 <li> You can make a subplot and then use the print function to | |
| 27 generate file with the plot.</li> | |
| 28 | |
| 29 <li> RGB line colors are supported if you use gnuplot 4.2. Octave | |
| 30 can still use gnuplot 4.0, but there is no way to set arbitrary | |
| 31 line colors with it when using the Matlab-style plot functions. | |
| 32 There never was any way to do this reliably with older versions | |
| 33 of gnuplot (whether run from Octave or not) since it only | |
| 34 provided a limited set to choose from, and they were terminal | |
| 35 dependent, so choosing color 1 with the X11 terminal would be | |
| 36 different from color 1 with the PostScript terminal. Valid RGB | |
| 37 colors for gnuplot 4.0 are the eight possible combinations of 0 | |
| 38 and 1 for the R, G and B values. Invalid values are all mapped | |
| 39 to the same color. | |
| 40 <p> | |
| 41 This also affects patch objects used in the bar, countour, meshc | |
| 42 and surfc functions, where the bars and contours will be | |
| 43 monochrome. A workaround for this is to type "colormap gmap40" | |
| 44 that loads a colormap that in many cases will be adequate for | |
| 45 simple bar and contour plots.</li> | |
| 46 | |
| 47 <li> You can control the width of lines using (for example): | |
| 48 <pre> | |
| 49 line (x, y, "linewidth", 4, "color", [1, 0, 0.5]); | |
| 50 </pre> | |
| 51 (this also shows the color feature).</li> | |
| 52 | |
| 53 <li> With gnuplot 4.2, image data is plotted with gnuplot and may be | |
| 54 combined with other 2-d plot data.</li> | |
| 55 | |
| 56 <li> Lines for contour plots are generated with an Octave function, so | |
| 57 contour plots are now 2-d plots instead of special 3-d plots, and | |
| 58 this allows you to plot additional 2-d data on top of a contour | |
| 59 plot.</li> | |
| 60 | |
| 61 <li> With the gnuplot "extended" terminals the TeX interpreter is | |
| 62 emulated. However, this means that the TeX interpreter is only | |
| 63 supported on the postscript terminals with gnuplot 4.0. Under | |
| 64 gnuplot 4.2 the terminals aqua, dumb, png, jpeg, gif, pm, windows, | |
| 65 wxt, svg and x11 are supported as well.</li> | |
| 66 | |
| 67 <li> The following plot commands are now considered obsolete and will | |
| 68 be removed from a future version of Octave: | |
| 69 <pre> | |
| 70 __gnuplot_set__ | |
| 71 __gnuplot_show__ | |
| 72 __gnuplot_plot__ | |
| 73 __gnuplot_splot__ | |
| 74 __gnuplot_replot__ | |
| 75 </pre> | |
| 76 Additionally, these functions no longer have any effect on plots | |
| 77 created with the Matlab-style plot commands | |
| 78 (<tt>plot</tt>, <tt>line</tt>, <tt>mesh</tt>, <tt>semilogx</tt>, | |
| 79 etc.). | |
| 80 | |
| 81 <li> Plot property values are not extensively checked. Specifying | |
| 82 invalid property values may produce unpredictible results.</li> | |
| 83 | |
| 84 <li> Octave now sends data over the same pipe that is used to send | |
| 85 commands to gnuplot. While this avoids the problem of | |
| 86 cluttering /tmp with data files, it is no longer possible to use | |
| 87 the mouse to zoom in on plots. This is a limitation of gnuplot, | |
| 88 which is unable to zoom when the data it plots is not stored in | |
| 89 a file. Some work has been done to fix this problem in newer | |
| 90 versions of gnuplot (> 4.2.2). See for example, | |
| 91 <a href="http://www.nabble.com/zooming-of-inline-data-tf4357017.html#a12416496">this thread</a> on the gnuplot development list. | |
| 92 </ul></li> | |
| 93 | |
| 94 | |
| 95 <li>The way Octave handles search paths has changed. Instead of | |
| 96 setting the built-in variable <tt>LOADPATH</tt>, you must | |
| 97 use <tt>addpath</tt>, <tt>rmpath</tt>, or <tt>path</tt> to | |
| 98 manipulate the function search path. These functions will | |
| 99 maintain <tt>"."</tt> at the head of the path, for compatibility | |
| 100 with Matlab. | |
| 101 <p> | |
| 102 Leading, trailing or doubled colons are no longer special. | |
| 103 Now, all elements of the search path are explicitly included in | |
| 104 the path when Octave starts. To display the path, use | |
| 105 the <tt>path</tt> function. | |
| 106 <p> | |
| 107 Path elements that end in <tt>//</tt> are no longer searched recursively. | |
| 108 Instead, you may use addpath and the genpath function to add an | |
| 109 entire directory tree to the path. For example, | |
| 110 <pre> | |
| 111 addpath (genpath ("~/octave")); | |
| 112 </pre> | |
| 113 will add ~/octave and all directories below it to the head of the | |
| 114 path.</li> | |
| 115 | |
| 116 | |
| 117 <li>Previous versions of Octave had a number of built-in variables to | |
| 118 control warnings (for example, <tt>warn_divide_by_zero</tt>). These | |
| 119 variables have been replaced by warning identifiers that are used | |
| 120 with the warning function to control the state of warnings. | |
| 121 <p> | |
| 122 For example, instead of writing | |
| 123 <pre> | |
| 124 warn_divide_by_zero = false; | |
| 125 </pre> | |
| 126 to disable divide-by-zero warnings, you should write | |
| 127 <pre> | |
| 128 warning ("off", "Octave:divide-by-zero"); | |
| 129 </pre> | |
| 130 You may use the same technique in your own code to control | |
| 131 warnings. For example, you can use | |
| 132 <pre> | |
| 133 warning ("My-package:phase-of-the-moon", | |
| 134 "the phase of the moon could cause trouble today"); | |
| 135 </pre> | |
| 136 to allow users to control this warning using the | |
| 137 <tt>"My-package:phase-of-the-moon"</tt> warning identifier. | |
| 138 <p> | |
| 139 You may also enable or disable all warnings, or turn them into | |
| 140 errors: | |
| 141 <pre> | |
| 142 warning ("on", "all"); | |
| 143 warning ("off", "all"); | |
| 144 warning ("error", "Octave:divide-by-zero"); | |
| 145 warning ("error", "all"); | |
| 146 </pre> | |
| 147 You can query the state of current warnings using | |
| 148 <pre> | |
| 149 warning ("query", ID) | |
| 150 warning ("query") | |
| 151 </pre> | |
| 152 (only those warning IDs which have been explicitly set are | |
| 153 returned). | |
| 154 <p> | |
| 155 A partial list and description of warning identifiers is available | |
| 156 using | |
| 157 <pre> | |
| 158 help warning_ids | |
| 159 </pre></li> | |
| 160 | |
| 161 | |
| 162 <li>All built-in variables have been converted to functions. This | |
| 163 change simplifies the interpreter and allows a consistent | |
| 164 interface to internal variables for user-defined packages and the | |
| 165 core functions distributed with Octave. In most cases, code that | |
| 166 simply accesses internal variables does not need to change. Code | |
| 167 that sets internal variables will change. For example, instead of | |
| 168 writing | |
| 169 <pre> | |
| 170 PS1 = ">> "; | |
| 171 </pre> | |
| 172 you will need to write | |
| 173 <pre> | |
| 174 PS1 (">> "); | |
| 175 </pre> | |
| 176 If you need write code that will run in both old and new versions | |
| 177 of Octave, you can use something like | |
| 178 <pre> | |
| 179 if (exist ("OCTAVE_VERSION") == 5) | |
| 180 ## New: | |
| 181 PS1 (">> "); | |
| 182 else | |
| 183 ## Old: | |
| 184 PS1 = ">> "; | |
| 185 endif | |
| 186 </pre></li> | |
| 187 | |
| 188 | |
| 189 <li>For compatibility with Matlab, the output order of Octave's | |
| 190 <tt>"system"</tt> function has changed from | |
| 191 <pre> | |
| 192 [output, status] = system (cmd); | |
| 193 </pre> | |
| 194 to | |
| 195 <pre> | |
| 196 [status, output] = system (cmd); | |
| 197 </pre></li> | |
| 198 | |
| 199 | |
| 200 <li>For compatibility with Matlab, <tt>normcdf</tt>, <tt>norminv</tt>, | |
| 201 <tt>normpdf</tt>, and <tt>normrnd</tt> have been modified to | |
| 202 compute distributions using the standard deviation instead of the | |
| 203 variance.</li> | |
| 204 | |
| 205 | |
| 206 <li>For compatibility with Matlab, the output of Octave's fsolve | |
| 207 function has been changed from | |
| 208 <pre> | |
| 209 [x, info, msg] = fsolve (...); | |
| 210 </pre> | |
| 211 to | |
| 212 <pre> | |
| 213 [x, fval, info] = fsolve (...); | |
| 214 </pre></li> | |
| 215 | |
| 216 | |
| 217 <li>For compatibility with Matlab, <tt>normcdf</tt>, <tt>norminv</tt>, | |
| 218 <tt>normpdf</tt>, and <tt>normrnd</tt> have been modified to | |
| 219 compute distributions using the standard deviation instead of the | |
| 220 variance.</li> | |
| 221 | |
| 222 | |
| 223 <li>For compatibility with | |
| 224 Matlab, <tt>gamcdf</tt>, <tt>gaminv</tt>, <tt>gampdf</tt>, | |
| 225 <tt>gamrnd</tt>, <tt>expcdf</tt>, <tt>expinv</tt>, <tt>exppdf</tt> | |
| 226 and <tt>exprnd</tt> have been modified to compute the | |
| 227 distributions using the standard scale factor rather than one over | |
| 228 the scale factor. | |
| 229 </ul> |