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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 ** The way Octave handles search paths has changed. Instead of |
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5 setting the built-in variable LOADPATH, you must use addpath, |
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6 rmpath, or path to manipulate the function search path. These |
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7 functions will maintain "." at the head of the path, for |
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8 compatibility with Matlab. |
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9 |
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10 Leading, trailing or doubled colons are no longer special. |
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11 Now, all elements of the search path are explicitly included in |
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12 the path when Octave starts. To display the path, use the path |
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13 function. |
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14 |
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15 Path elements that end in // are no longer searched recursively. |
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16 Instead, you may use addpath and the genpath function to add an |
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17 entire directory tree to the path. For example, |
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18 |
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19 addpath (genpath ("~/octave")); |
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20 |
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21 will add ~/octave and all directories below it to the head of the |
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22 path. |
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23 |
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24 |
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25 ** Previous versions of Octave had a number of built-in variables to |
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26 control warnings (for example, warn_divide_by_zero). These |
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27 variables have been replaced by warning identifiers that are used |
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28 with the warning function to control the state of warnings. |
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29 |
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30 For example, instead of writing |
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31 |
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32 warn_divide_by_zero = false; |
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33 |
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34 to disable divide-by-zero warnings, you should write |
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35 |
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36 warning ("off", "Octave:divide-by-zero"); |
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37 |
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38 You may use the same technique in your own code to control |
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39 warnings. For example, you can use |
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40 |
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41 warning ("My-package:phase-of-the-moon", |
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42 "the phase of the moon could cause trouble today"); |
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43 |
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44 to allow users to control this warning using the |
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45 "My-package:phase-of-the-moon" warning identifier. |
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46 |
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47 You may also enable or disable all warnings, or turn them into |
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48 errors: |
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49 |
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50 warning ("on", "all"); |
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51 warning ("off", "all"); |
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52 warning ("error", "Octave:divide-by-zero"); |
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53 warning ("error", "all"); |
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54 |
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55 You can query the state of current warnings using |
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56 |
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57 warning ("query", ID) |
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58 warning ("query") |
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59 |
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60 (only those warning IDs which have been explicitly set are |
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61 returned). |
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62 |
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63 A partial list and description of warning identifiers is available |
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64 using |
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65 |
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66 help warning_ids |
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67 |
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68 |
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69 ** All built-in variables have been converted to functions. This |
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70 change simplifies the interpreter and allows a consistent |
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71 interface to internal variables for user-defined packages and the |
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72 core functions distributed with Octave. In most cases, code that |
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73 simply accesses internal variables does not need to change. Code |
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74 that sets internal variables will change. For example, instead of |
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75 writing |
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76 |
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77 PS1 = ">> "; |
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78 |
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79 you will need to write |
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80 |
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81 PS1 (">> "); |
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82 |
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83 If you need write code that will run in both old and new versions |
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84 of Octave, you can use something like |
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85 |
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86 if (exist ("OCTAVE_VERSION") == 5) |
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87 ## New: |
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88 PS1 (">> "); |
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89 else |
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90 ## Old: |
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91 PS1 = ">> "; |
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92 endif |
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93 |
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94 |
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95 ** For compatibility with Matlab, the output order of Octave's |
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96 "system" function has changed from |
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97 |
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98 [output, status] = system (cmd); |
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99 |
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100 to |
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101 |
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102 [status, output] = system (cmd); |
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103 |
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104 |
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105 See NEWS.2 for old news. |
