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1 Summary of changes for version 2.0: |
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2 ---------------------------------- |
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3 |
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4 * New data types can be added to Octave by writing a C++ class. On |
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5 systems that support dynamic linking, new data types can be added |
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6 to an already running Octave binary. A simple example appears in |
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7 the file examples/make_int.cc. Other examples are the standard |
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8 Octave data types defined in the files src/ov*.{h,cc} and |
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9 src/op-*.cc. [This feature should be better documented by the |
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10 time 2.0 is released]. |
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11 |
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12 * The configure option --enable-bounds-check turns on bounds |
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13 checking on element references for Octave's internal array and |
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14 matrix classes. It's enabled by default. To disable this |
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15 feature, configure Octave with --disable-bounds-check. |
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16 |
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17 * The C-style I/O functions (fopen, fprintf, etc.) have been |
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18 rewritten to be more compatible with Matlab. The fputs function |
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19 has also been added. Usage of the *printf functions that was |
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20 allowed in previous versions of Octave should still work. |
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21 However, there is no way to make the new versions of the *scanf |
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22 functions compatible with Matlab *and* previous versions of |
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23 Octave. An optional argument to the *scanf functions is now |
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24 available to make them behave in a way that is compatible with |
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25 previous versions of Octave. |
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26 |
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27 * The interface to the pager has changed. The new built-in variable |
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28 `page_output_immediately' controls when Octave sends output to the |
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29 pager. If it is nonzero, Octave sends output to the pager as soon |
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30 as it is available. Otherwise, Octave buffers its output and |
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31 waits until just before the prompt is printed to flush it to the |
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32 pager. |
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33 |
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34 * Expressions of the form |
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35 |
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36 A(i,j) = x |
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37 |
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38 where X is a scalar and the indices i and j define a matrix of |
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39 elements now work as you would expect rather than giving an error. |
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40 I am told that this is how Matlab 5.0 will behave when it is |
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41 released. |
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42 |
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43 * Indexing of character strings now works. |
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44 |
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45 * The echo command has been implemented. |
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46 |
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47 * The document command is now a regular function. |
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48 |
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49 * New method for handling errors: |
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50 |
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51 try |
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52 BODY |
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53 catch |
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54 CLEANUP |
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55 end_try_catch |
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56 |
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57 Where BODY and CLEANUP are both optional and may contain any |
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58 Octave expressions or commands. The statements in CLEANUP are |
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59 only executed if an error occurs in BODY. |
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60 |
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61 No warnings or error messages are printed while BODY is |
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62 executing. If an error does occur during the execution of BODY, |
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63 CLEANUP can access the text of the message that would have been |
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64 printed in the builtin constant __error_text__. This is the same |
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65 as eval (TRY, CATCH) (which may now also use __error_text__) but |
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66 it is more efficient since the commands do not need to be parsed |
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67 each time the TRY and CATCH statements are evaluated. |
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68 |
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69 * Octave no longer parses the help command by grabbing everything |
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70 after the keyword `help' until a newline character is read. To |
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71 get help for `;' or `,', now, you need to use the command |
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72 `help semicolon' or `help comma'. |
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73 |
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74 * Octave's parser now does some simple constant folding. This means |
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75 that expressions like 3*i are now evaluated only once, when a |
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76 function is compiled, and the right hand side of expressions like |
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77 a = [1,2;3,4] are treated as true matrix constants rather than |
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78 lists of elements which must be evaluated each time they are |
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79 needed. |
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80 |
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81 * Built-in variables that can take values of "true" and "false" can |
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82 now also be set to any nonzero scalar value to indicate "true", |
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83 and 0 to indicate "false". |
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84 |
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85 * New built-in variables `history_file', `history_size', and |
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86 `saving_history'. |
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87 |
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88 * New built-in variable `string_fill_char' specifies the character |
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89 to fill with when creating arrays of strings. |
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90 |
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91 * If the new built-in variable `gnuplot_has_frames' is nonzero, |
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92 Octave assumes that your copy of gnuplot includes support for |
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93 multiple plot windows when using X11. |
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94 |
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95 If the new built-in variable `gnuplot_has_multiplot' is nonzero, |
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96 Octave assumes that your copy of gnuplot has the multiplot support |
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97 that is included in recent 3.6beta releases. |
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98 |
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99 The initial values of these variables are determined by configure, |
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100 but can be changed in your startup script or at the command line |
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101 in case configure got it wrong, or if you upgrade your gnuplot |
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102 installation. |
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103 |
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104 * The new plot function `figure' allows multiple plot windows when |
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105 using newer versions of gnuplot with X11. |
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106 |
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107 * Octave now notices when the plotter has exited unexpectedly. |
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108 |
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109 * New built-in variable `warn_missing_semicolon'. If nonzero, Octave |
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110 will warn when statements in function definitions don't end in |
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111 semicolons. The default value is 0. |
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112 |
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113 * Octave now attempts to continue after floating point exceptions |
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114 or out-of-memory errors. |
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115 |
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116 * If Octave crashes, it now attempts to save all user-defined |
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117 variables in a file named `octave-core' in the current directory |
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118 before exiting. |
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119 |
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120 * It is now possible to get the values of individual option settings |
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121 for the dassl, fsolve, lsode, npsol, qpsol, and quad functions |
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122 using commands like |
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123 |
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124 dassl_reltol = dassl_options ("relative tolerance"); |
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125 |
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126 * The svd() function no longer computes the left and right singular |
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127 matrices unnecessarily. This can significantly improve |
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128 performance for large matrices if you are just looking for the |
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129 singular values. |
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130 |
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131 * The filter() function is now a built-in function. |
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132 |
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133 * New function randn() returns a pseudo-random number from a normal |
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134 distribution. The rand() and randn() functions have separate |
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135 seeds and generators. |
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136 |
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137 * Octave's command-line arguments are now available in the built-in |
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138 variable `argv'. The program name is also available in the |
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139 variables `program_invocation_name' and `program_name'. If |
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140 executing a script from the command line (e.g., octave foo.m) or |
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141 using the `#! /bin/octave' hack, the program name is set to the |
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142 name of the script. |
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143 |
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144 * New built-in variable `completion_append_char' used as the |
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145 character to append to successful command-line completion |
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146 attempts. The default is " " (a single space). |
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147 |
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148 * Octave now uses a modified copy of the readline library from |
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149 version 1.14.5 of GNU bash. |
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150 |
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151 * In prompt strings, `\H' expands to the whole host name. |
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152 |
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153 * New built-in variable `beep_on_error'. If nonzero, Octave will try |
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154 to ring your terminal's bell before printing an error message. |
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155 The default value is 0. |
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156 |
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157 * New command-line argument --traditional sets the following |
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158 preference variables for compatibility with Matlab: |
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159 |
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160 PS1 = ">> " |
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161 PS2 = "" |
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162 beep_on_error = 1 |
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163 default_save_format = "mat-binary" |
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164 define_all_return_values = 1 |
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165 do_fortran_indexing = 1 |
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166 empty_list_elements_ok = 1 |
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167 implicit_str_to_num_ok = 1 |
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168 ok_to_lose_imaginary_part = 1 |
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169 page_screen_output = 0 |
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170 prefer_column_vectors = 0 |
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171 prefer_zero_one_indexing = 1 |
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172 print_empty_dimensions = 0 |
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173 treat_neg_dim_as_zero = 1 |
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174 warn_function_name_clash = 0 |
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175 whitespace_in_literal_matrix = "traditional" |
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176 |
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177 * New functions: |
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178 |
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179 readdir -- returns names of files in directory as array of strings |
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180 mkdir -- create a directory |
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181 rmdir -- remove a directory |
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182 rename -- rename a file |
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183 unlink -- delete a file |
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184 umask -- set permission mask for file creation |
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185 stat -- get information about a file |
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186 lstat -- get information about a symbolic link |
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187 more -- turn the pager on or off |
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188 gammaln -- alias for lgamma |
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189 |
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190 * New audio functions from Andreas Weingessel |
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191 <Andreas.Weingessel@ci.tuwien.ac.at>. |
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192 |
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193 lin2mu -- linear to mu-law encoding |
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194 loadaudio -- load an audio file to a vector |
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195 mu2lin -- mu-law to linear encoding |
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196 playaudio -- play an audio file |
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197 record -- record sound and store in vector |
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198 saveaudio -- save a vector as an audio file |
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199 setaudio -- executes mixer shell command |
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200 |
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201 * New plotting functions from Vinayak Dutt. Ones dealing with |
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202 multiple plots on one page require features from gnuplot 3.6beta |
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203 (or later). |
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204 |
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205 bottom_title -- put title at the bottom of the plot |
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206 mplot -- multiplot version of plot |
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207 multiplot -- switch multiple-plot mode on or off |
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208 oneplot -- return to one plot per page |
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209 plot_border -- put a border around plots |
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210 subplot -- position multiple plots on a single page |
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211 subwindow -- set subwindow position for next plot |
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212 top_title -- put title at the top of the plot |
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213 zlabel -- put a label on the z-axis |
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214 |
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215 * New string functions |
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216 |
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217 bin2dec -- convert a string of ones and zeros to an integer |
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218 blanks -- create a string of blanks |
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219 deblank -- delete trailing blanks |
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220 dec2bin -- convert an integer to a string of ones and zeros |
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221 dec2hex -- convert an integer to a hexadecimal string |
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222 findstr -- locate occurrences of one string in another |
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223 hex2dec -- convert a hexadecimal string to an integer |
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224 index -- return position of first occurrence a string in another |
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225 rindex -- return position of last occurrence a string in another |
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226 split -- divide one string into pieces separated by another |
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227 str2mat -- create a string matrix from a list of strings |
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228 strrep -- replace substrings in a string |
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229 substr -- extract a substring |
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230 |
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231 The following functions return a matrix of ones and zeros. |
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232 Elements that are nonzero indicate that the condition was true for |
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233 the corresponding character in the string array. |
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234 |
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235 isalnum -- letter or a digit |
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236 isalpha -- letter |
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237 isascii -- ascii |
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238 iscntrl -- control character |
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239 isdigit -- digit |
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240 isgraph -- printable (but not space character) |
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241 islower -- lower case |
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242 isprint -- printable (including space character) |
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243 ispunct -- punctuation |
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244 isspace -- whitespace |
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245 isupper -- upper case |
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246 isxdigit -- hexadecimal digit |
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247 |
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248 These functions return new strings. |
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249 |
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250 tolower -- convert to lower case |
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251 toupper -- convert to upper case |
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252 |
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253 * New function, fgetl. Both fgetl and fgets accept an optional |
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254 second argument that specifies a maximum number of characters to |
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255 read, and the function fgets is now compatible with Matlab. |
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256 |
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257 * Printing in hexadecimal format now works (format hex). It is also |
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258 possible to print the internal bit representation of a value |
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259 (format bit). Note that these formats are only implemented for |
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260 numeric values. |
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261 |
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262 * Additional structure features: |
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263 |
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264 -- Name completion now works for structures. |
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265 |
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266 -- Values and names of structure elements are now printed by |
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267 default. The new built-in variable `struct_levels_to_print' |
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268 controls the depth of nested structures to print. The default |
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269 value is 2. |
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270 |
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271 -- New functions: |
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272 |
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273 struct_contains (S, NAME) -- returns 1 if S is a structure with |
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274 element NAME; otherwise returns 0. |
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275 |
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276 struct_elements (S) -- returns the names of all elements |
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277 of structure S in an array of strings. |
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278 |
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279 * New io/subprocess functions: |
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280 |
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281 fputs -- write a string to a file with no formatting |
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282 popen2 -- start a subprocess with 2-way communication |
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283 mkfifo -- create a FIFO special file |
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284 popen -- open a pipe to a subprocess |
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285 pclose -- close a pipe from a subprocess |
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286 waitpid -- check the status of or wait for subprocesses |
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287 |
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288 * New time functions: |
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289 |
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290 asctime -- format time structure according to local format |
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291 ctime -- equivalent to `asctime (localtime (TMSTRUCT))' |
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292 gmtime -- return time structure corresponding to UTC |
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293 localtime -- return time structure corresponding to local time zone |
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294 strftime -- print given time structure using specified format |
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295 time -- return current time |
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296 |
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297 The `clock' and `date' functions are now implemented in M-files |
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298 using these basic functions. |
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299 |
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300 * Access to additional Unix system calls: |
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301 |
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302 dup2 -- duplicate a file descriptor |
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303 exec -- replace current process with a new process |
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304 fcntl -- control open file descriptors |
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305 fork -- create a copy of the current process |
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306 getpgrp -- return the process group id of the current process |
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307 getpid -- return the process id of the current process |
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308 getppid -- return the process id of the parent process |
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309 pipe -- create an interprocess channel |
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310 |
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311 * Other new functions: |
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312 |
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313 atexit -- register functions to be called when Octave exits |
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314 putenv -- define an environment variable |
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315 meshgrid -- compatible with Matlab's meshgrid function |
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316 tilde_expand -- perform tilde expansion on string |
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317 completion_matches -- perform command completion on string |
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318 |
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319 * The New function octave_config_info returns a structure containing |
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320 information about how Octave was configured and compiled. |
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321 |
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322 * New function getrusage returns a structure containing system |
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323 resource usage statistics. The `cputime' function is now defined |
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324 in an M-file using getrusage. |
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325 |
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326 * The info reader is now a separate binary that runs as a |
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327 subprocess. You still need the info reader distributed with |
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328 Octave though, because there are some new command-line arguments |
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329 that are not yet available in the public release of Info. |
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330 |
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331 * There is a new built-in variable, INFO_PROGRAM, which is used as |
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332 the name of the info program to run. Its initial value is |
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333 $OCTAVE_HOME/lib/octave/VERSION/exec/ARCH/info, but that value can |
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334 be overridden by the environment variable OCTAVE_INFO_PROGRAM, or |
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335 the command line argument --info-program NAME, or by setting the |
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336 value of INFO_PROGRAM in a startup script. |
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337 |
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338 * There is a new built-in variable, EXEC_PATH, which is used as |
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339 the list of directories to search when executing subprograms. Its |
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340 initial value is taken from the environment variable |
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341 OCTAVE_EXEC_PATH (if it exists) or PATH, but that value can be |
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342 overridden by the the command line argument --exec-path PATH, or |
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343 by setting the value of EXEC_PATH in a startup script. If the |
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344 EXEC_PATH begins (ends) with a colon, the directories |
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345 $OCTAVE_HOME/lib/octave/VERSION/exec/ARCH and $OCTAVE_HOME/bin are |
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346 prepended (appended) to EXEC_PATH (if you don't specify a value |
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347 for EXEC_PATH explicitly, these special directories are prepended |
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348 to your PATH). |
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349 |
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350 * If it is present, Octave will now use an `ls-R' database file to |
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351 speed up recursive path searching. Octave looks for a file called |
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352 ls-R in the directory specified by the environment variable |
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353 OCTAVE_DB_DIR. If that is not set but the environment variable |
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354 OCTAVE_HOME is set, Octave looks in $OCTAVE_HOME/lib/octave. |
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355 Otherwise, Octave looks in the directory $datadir/octave (normally |
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356 /usr/local/lib/octave). |
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357 |
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358 * New examples directory. |
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359 |
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360 * There is a new script, mkoctfile, that can be used to create .oct |
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361 files suitable for dynamic linking. |
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362 |
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363 * Many more bug fixes. |
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364 |
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365 * ChangeLogs are now kept in each subdirectory. |
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366 |
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367 See NEWS.1 for old news. |
