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1 Summary of important user-visible changes for version 3.0: |
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2 --------------------------------------------------------- |
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3 |
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4 ** Compatibility with Matlab graphics is much better now. We now |
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5 have some graphics features that work like Matlab's Handle |
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6 Graphics (tm): |
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7 |
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8 + You can make a subplot and then use the print function to |
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9 generate file with the plot. |
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10 |
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11 + RGB line colors are supported if you use gnuplot 4.2. Octave |
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12 can still use gnuplot 4.0, but there is no way to set arbitrary |
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13 line colors with it when using the Matlab-style plot functions. |
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14 There never was any way to do this reliably with older versions |
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15 of gnuplot (whether run from Octave or not) since it only |
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16 provided a limited set to choose from, and they were terminal |
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17 dependent, so choosing color 1 with the X11 terminal would be |
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18 different from color 1 with the PostScript terminal. Valid RGB |
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19 colors for gnuplot 4.0 are the eight possible combinations of 0 |
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20 and 1 for the R, G and B values. Invalid values are all mapped |
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21 to the same color. |
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22 |
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23 + You can control the width of lines using (for example): |
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24 |
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25 line (x, y, "linewidth", 4, "color", [1, 0, 0.5]); |
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26 |
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27 (this also shows the color feature). |
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28 |
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29 + With gnuplot 4.2, image data is plotted with gnuplot and may be |
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30 combined with other 2-d plot data. |
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31 |
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32 + Lines for contour plots are generated with an Octave function, so |
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33 contour plots are now 2-d plots instead of special 3-d plots, and |
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34 this allows you to plot additional 2-d data on top of a contour |
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35 plot. |
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36 |
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37 + It is no longer possible to mix Matlab-style plot commands with |
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38 the old (and now considered obsolete) style of plot commands |
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39 (__gnuplot_set__, etc.). You can do one or the other, but not |
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40 both for the same plot. |
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41 |
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42 + Plot property values are not extensively checked. Specifying |
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43 invalid property values may produce unpredictible results. |
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44 |
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45 + Octave no longer creates temporary data files for plotting, but |
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46 instead sends data over the same pipe that is used to send |
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47 commands to gnuplot. While this avoids the problem of |
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48 cluttering /tmp with data files, it is no longer possible to use |
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49 the mouse to zoom in on plots. This is a limitation of gnuplot, |
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50 which is unable to zoom when the data it plots is not stored in |
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51 a file. |
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52 |
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53 ** The way Octave handles search paths has changed. Instead of |
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54 setting the built-in variable LOADPATH, you must use addpath, |
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55 rmpath, or path to manipulate the function search path. These |
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56 functions will maintain "." at the head of the path, for |
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57 compatibility with Matlab. |
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58 |
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59 Leading, trailing or doubled colons are no longer special. |
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60 Now, all elements of the search path are explicitly included in |
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61 the path when Octave starts. To display the path, use the path |
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62 function. |
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63 |
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64 Path elements that end in // are no longer searched recursively. |
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65 Instead, you may use addpath and the genpath function to add an |
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66 entire directory tree to the path. For example, |
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67 |
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68 addpath (genpath ("~/octave")); |
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69 |
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70 will add ~/octave and all directories below it to the head of the |
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71 path. |
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72 |
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73 |
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74 ** Previous versions of Octave had a number of built-in variables to |
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75 control warnings (for example, warn_divide_by_zero). These |
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76 variables have been replaced by warning identifiers that are used |
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77 with the warning function to control the state of warnings. |
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78 |
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79 For example, instead of writing |
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80 |
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81 warn_divide_by_zero = false; |
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82 |
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83 to disable divide-by-zero warnings, you should write |
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84 |
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85 warning ("off", "Octave:divide-by-zero"); |
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86 |
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87 You may use the same technique in your own code to control |
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88 warnings. For example, you can use |
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89 |
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90 warning ("My-package:phase-of-the-moon", |
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91 "the phase of the moon could cause trouble today"); |
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92 |
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93 to allow users to control this warning using the |
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94 "My-package:phase-of-the-moon" warning identifier. |
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95 |
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96 You may also enable or disable all warnings, or turn them into |
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97 errors: |
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98 |
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99 warning ("on", "all"); |
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100 warning ("off", "all"); |
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101 warning ("error", "Octave:divide-by-zero"); |
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102 warning ("error", "all"); |
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103 |
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104 You can query the state of current warnings using |
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105 |
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106 warning ("query", ID) |
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107 warning ("query") |
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108 |
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109 (only those warning IDs which have been explicitly set are |
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110 returned). |
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111 |
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112 A partial list and description of warning identifiers is available |
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113 using |
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114 |
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115 help warning_ids |
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116 |
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117 |
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118 ** All built-in variables have been converted to functions. This |
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119 change simplifies the interpreter and allows a consistent |
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120 interface to internal variables for user-defined packages and the |
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121 core functions distributed with Octave. In most cases, code that |
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122 simply accesses internal variables does not need to change. Code |
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123 that sets internal variables will change. For example, instead of |
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124 writing |
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125 |
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126 PS1 = ">> "; |
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127 |
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128 you will need to write |
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129 |
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130 PS1 (">> "); |
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131 |
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132 If you need write code that will run in both old and new versions |
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133 of Octave, you can use something like |
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134 |
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135 if (exist ("OCTAVE_VERSION") == 5) |
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136 ## New: |
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137 PS1 (">> "); |
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138 else |
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139 ## Old: |
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140 PS1 = ">> "; |
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141 endif |
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142 |
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143 |
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144 ** For compatibility with Matlab, the output order of Octave's |
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145 "system" function has changed from |
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146 |
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147 [output, status] = system (cmd); |
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148 |
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149 to |
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150 |
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151 [status, output] = system (cmd); |
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152 |
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153 ** For compatibility with Matlab, normcdf, norminv, normpdf, and |
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154 normrnd have been modified to compute distributions using the |
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155 standard deviation instead of the variance. |
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156 |
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157 ** For compatibility with Matlab, gamcdf, gaminv, gampdf, gamrnd, |
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158 expcdf, expinv, exppdf and exprnd have been modified to compute |
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159 the distributions using the standard scale factor rather than |
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160 one over the scale factor. |
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161 |
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162 See NEWS.2 for old news. |
