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1 <html> |
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2 <pre> |
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3 Octave PROJECTS -*- text -*- |
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4 =============== |
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5 |
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6 Check with bug-octave@bevo.che.wisc.edu for a possibly more current |
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7 copy. Also, if you start working steadily on a project, please let |
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8 bug-octave@bevo.che.wisc.edu know. We might have information that |
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9 could help you; we'd also like to send you the GNU coding standards. |
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10 |
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11 This list is not exclusive -- there are many other things that might |
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12 be good projects, but it might instead be something we already have, |
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13 so check with bug-octave@bevo.che.wisc.edu before you start. |
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14 |
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15 --------- |
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16 Numerical: |
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17 --------- |
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18 |
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19 * Improve logm, and sqrtm. |
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20 |
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21 * Improve complex mapper functions. See W. Kahan, ``Branch Cuts for |
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22 Complex Elementary Functions, or Much Ado About Nothing's Sign |
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23 Bit'' (in The State of the Art in Numerical Analysis, eds. Iserles |
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24 and Powell, Clarendon Press, Oxford, 1987) for explicit |
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25 trigonometric formulae. |
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26 |
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27 * Make functions like gamma() return the right IEEE Inf or NaN |
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28 values for extreme args or other undefined cases. |
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29 |
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30 * Handle complex values in fread and fwrite. |
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31 |
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32 * Support for lp_solve for linear programming problems. |
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33 |
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34 * Free QP solver. |
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35 |
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36 * Free NLP solver. |
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37 |
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38 * Support for sparse matrices. |
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39 |
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40 * Fix CollocWt to handle Laguerre polynomials. Make it easy to |
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41 extend it to other polynomial types. |
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42 |
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43 * Make filter faster (perhaps by calling BLAS functions). |
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44 |
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45 * Add optional arguments to colloc so that it's not restricted to |
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46 Legendre polynomials. |
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47 |
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48 * Fix eig to also be able to solve the generalized eigenvalue |
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49 problem, and to solve for eigenvalues and eigenvectors without |
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50 performing a balancing step first. |
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51 |
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52 * Move rand, eye, xpow, xdiv, etc., functions to the matrix classes. |
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53 |
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54 * Use octave_allocator for memory management in Array classes once |
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55 g++ supports static member templates. |
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56 |
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57 * Implement the following functions: |
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58 -- ppval -- cross -- dot |
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59 |
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60 * When constructing NLConst (and other) objects, make sure that |
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61 there are sufficient checks to ensure that the dimensions all |
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62 conform. |
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63 |
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64 * Allow parameters to be passed through the call to fsolve() to the |
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65 user-supplied function for Matlab compatibility. Don't place an |
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66 upper limit on the number of arguments. |
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67 |
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68 * Check matrix classes for proper handling of empty matrices. |
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69 |
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70 * Make operations with empty matrices produce empty matrices, for |
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71 compatibility with Matlab (but only if Matlab 5 still does things |
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72 this way). For example: [1, 2] * [] ==> []. |
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73 |
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74 * Improve design of ODE, DAE, classes. |
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75 |
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76 * Extend meaning of .* to include v .* M or M .* v (where v is a |
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77 column vector with the same number of rows as M) to scale rows of |
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78 M by elements of v. Similarly, if w is a row vector with as many |
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79 columns as M, then either w .* M or M .* w scales the columns of |
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80 M. |
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81 |
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82 * Given two vectors x and y of length m and n, implement a function |
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83 outer (x, y, f) that returns an m-by-n matrix with entries |
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84 f (x(i), y(j)). If f is omitted, multiplication is the default. |
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85 Should probably work for any vectors, not just if x is a column |
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86 vector and y is a row vector. |
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87 |
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88 * Make it possible to solve b = L \ x efficiently, either by |
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89 providing an explicit function call, or by automatically |
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90 determining that L is triangular. If it is done automatically, |
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91 provide some means for determining whether Octave has actually |
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92 detected that the matrix is triangular. |
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93 |
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94 * The polyfit function uses the economy QR factorization, but even |
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95 that can take a lot of time for large datasets. Consider an |
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96 option to compute the result with inv (A' * A) * A' * y or some |
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97 other faster method.d Possibly just switch to this method if the |
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98 dataset is larger than some value. |
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99 |
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100 * Make QR more memory efficient for large matrices when not all the |
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101 columns of Q are required (apparently this is not handled by the |
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102 lapack code yet). |
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103 |
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104 * Consider making the behavior of the / and \ operators for |
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105 non-square systems compatible with Matlab. Currently, they return |
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106 the minimum norm solution from DGELSS, which behaves differently. |
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107 |
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108 -------- |
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109 Graphics: |
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110 -------- |
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111 |
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112 * Make plotting with plplot work. |
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113 |
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114 * Fix interface with gnuplot to wait for gnuplot to output any text |
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115 before octave returns a prompt. Possible by implementing two |
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116 way communication between gnuplot and Octave. |
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117 |
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118 * Handle gnuplot ranges correctly for parametric modes (accept 3 |
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119 ranges for 2d plots and 5 ranges for 3d plots). |
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120 |
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121 * Make gsave (and possibly gload) work. Implement gsave by having it |
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122 also alter the plot command to not use temporary files (perhaps |
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123 with some user-specified template for naming them) and then |
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124 sending a `save' command to gnuplot. |
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125 |
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126 * It would be nice to be able to check that a plot is currently |
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127 being displayed. |
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128 |
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129 * Implement clf, gcf, get, set, orient, print, close, etc. in |
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130 Matlab-compatible ways. |
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131 |
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132 * Make it possible to check the current graphics terminal type. |
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133 |
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134 * If possible, pass data to gnuplot without using temporary files. |
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135 |
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136 * If possible, pass binary data to gnuplot to speed things up. |
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137 |
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138 * If using gnuplot, consider setting a smaller default for the |
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139 `zero' value (e.g., set zero sqrt (realmin) or something). |
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140 |
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141 ------- |
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142 Strings: |
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143 ------- |
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144 |
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145 * Improve performance of string functions, particularly for |
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146 searching and replacing. |
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147 |
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148 * Provide some regex matching functions. |
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149 |
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150 * Convert string functions to work on string arrays. |
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151 |
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152 * Make find work for strings. |
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153 |
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154 * Consider making octave_print_internal() print some sort of text |
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155 representation for unprintable characters instead of sending them |
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156 directly to the terminal. (But don't do this for fprintf!) |
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157 |
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158 * Consider changing the default value of `string_fill_char' from SPC |
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159 to NUL. |
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160 |
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161 * Consider making ["test", []] ==> "test", for compatibility with |
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162 Matlab, at least when some set of preferences are set. |
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163 |
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164 ---------------- |
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165 Other Data Types: |
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166 ---------------- |
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167 |
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168 * Template functions for mixed-type ops. |
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169 |
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170 ------------------------ |
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171 Graphical User Interface: |
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172 ------------------------ |
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173 |
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174 * In an X11 or other windowing environment, allow the user to pop up |
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175 windows for menus and other purposes. A good place to start might |
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176 be Tk, as long as Tcl is avoided. |
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177 |
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178 * Add a way to handle events, like alarms, mouse clicks, etc. |
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179 |
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180 ------------ |
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181 Input/Output: |
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182 ------------ |
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183 |
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184 * Make fread and fwrite work for complex data. Iostreams based |
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185 versions of these functions would also be nice, and if you are |
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186 working on them, it would be good to support other size |
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187 specifications (integer*2, etc.). |
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188 |
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189 * Make fread and fopen look in LOADPATH for files. |
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190 |
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191 * Make load and save look for <file>.mat if only given <file>. |
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192 |
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193 Potential sticky points: |
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194 |
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195 - For load, if both foo and foo.mat exist, should it prefer foo |
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196 or foo.mat? Should the preference depend on the arguments to |
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197 load? I think it should only prefer .mat files if the |
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198 -mat-binary option is supplied, or if the file foo.mat exists |
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199 but the file foo does not. |
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200 |
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201 - For save, should it prefer to create foo or foo.mat? Should |
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202 the preference depend on the arguments to save? Should the |
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203 default_save_format imply a default preference? I think it |
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204 should only create .mat files if it is writing Matlab |
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205 compatible files. |
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206 |
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207 * Move some pr-output stuff to liboctave. |
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208 |
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209 * Make the cutoff point for changing to packed storage a |
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210 user-preference variable with default value 8192. |
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211 |
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212 * Make it possible to load other image formats (ppm, pbm, etc. would |
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213 probably be best since there are already filters to convert to |
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214 these formats from others.) |
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215 |
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216 * Complain if there is not enough disk space available (I think |
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217 there is simply not enough error checking in the code that handles |
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218 writing data). |
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219 |
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220 * Make it possible to tie arbitrary input and output streams |
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221 together, similar to the way iostreams can be tied together. |
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222 |
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223 ----------- |
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224 Interpreter: |
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225 ----------- |
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226 |
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227 * Allow customization of the debug prompt. |
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228 |
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229 * For the keyboard function, parse return (or quit) more |
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230 intelligently so that something like |
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231 |
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232 debug> x = 1; return |
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233 |
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234 will work as expected. |
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235 |
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236 * Handle multi-line input at the keyboard/debug prompt correctly. |
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237 |
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238 * Fix the parser so that |
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239 |
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240 if (expr) 'this is a string' end |
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241 |
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242 is parsed as IF expr STRING END. |
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243 |
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244 * Consider grouping all preference variables in a structure instead |
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245 of further polluting the namespace. Maybe `Octave_options.xxx'? |
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246 |
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247 * Rewrite functions in input.cc to do the right thing in all cases |
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248 of using readline, forced interactive behavior, echoing of input, |
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249 etc. |
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250 |
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251 * Consider making linspace() and logspace() return the value |
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252 corresponding to the first argument if the number of requested |
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253 points is 1. |
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254 |
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255 * Consider allowing an arbitrary property list to be attached to any |
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256 variable. This could be a more general way to handle the help |
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257 string that can currently be added with `document'. |
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258 |
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259 * Allow more command line options to be accessible as built-in |
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260 variables (--echo-commands, etc.). |
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261 |
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262 * Allow `octave -c STRING' to execute commands from STRING then |
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263 exit. |
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264 |
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265 * Make the interpreter run faster. |
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266 |
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267 * Make it possible to disable or enable all warnings on an |
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268 individual basis from the command line or via some built-in |
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269 structure variable. |
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270 |
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271 * Warn about complex comparisons? Could just use double_value() or |
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272 matrix_value() instead of explicit conversions to real types. For |
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273 this to really be useful, some additional information must be |
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274 available to point to the location of the code that triggers the |
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275 warning. |
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276 |
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277 * Allow arbitrary lower bounds for array indexing. |
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278 |
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279 * Improve performance of recursive function calls. |
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280 |
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281 * Improve the way ignore_function_time_stamp works to allow |
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282 selecting by individual directories or functions. |
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283 |
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284 * Add a command-line option to tell Octave to just do syntax |
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285 checking and not execute statements. |
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286 |
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287 * Is it necessary for do_binary_op and do_unary_op to be friends of |
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288 the tree_constant class. |
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289 |
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290 * Clean up symtab and variable stuff. |
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291 |
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292 * Input stream class for parser files -- must manage buffers for |
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293 flex and context for global variable settings. |
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294 |
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295 * make parser do more semantic checking, continue after errors when |
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296 compiling functions, etc. |
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297 |
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298 * Make LEXICAL_ERROR have a value that is the error message for |
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299 parse_error() to print? |
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300 |
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301 * Add a run-time alias mechanism that would allow things like |
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302 |
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303 alias fun function_with_a_very_long_name |
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304 |
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305 so that `function_with_a_very_long_name' could be invoked as |
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306 `fun'. |
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307 |
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308 * What should is_global() return when called for built-in variables? |
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309 |
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310 * Allow local changes to variables to be written more compactly than |
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311 is currently possible with unwind_protect. For example, |
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312 |
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313 function f () |
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314 local prefer_column_vectors = something; |
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315 ... |
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316 endfunction |
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317 |
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318 would be equivalent to |
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319 |
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320 function f () |
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321 save_prefer_column_vectors = prefer_column_vectors; |
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322 unwind_protect |
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323 prefer_column_vectors = something; |
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324 ... |
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325 unwind_protect_cleanup |
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326 prefer_column_vectors = save_prefer_column_vectors; |
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327 end_unwind_protect |
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328 endfunction |
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329 |
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330 * Fix all function files to check for bogus inputs (wrong number or |
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331 types of input arguments, wrong number of output arguments). |
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332 |
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333 * Reduce the memory and time required to parse very large matrix |
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334 lists. |
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335 |
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336 * Handle options for built-in functions more consistently. |
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337 |
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338 * Too much time is spent allocating and freeing memory. What can be |
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339 done to improve performance? |
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340 |
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341 * Error output from Fortran code is ugly. Something should be done to |
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342 make it look better. |
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343 |
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344 * It would be nice if output from the Fortran routines could be |
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345 passed through the pager. |
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346 |
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347 * Attempt to recognize common subexpressions in the parser. |
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348 |
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349 * Handle arrays with more than two dimensions. |
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350 |
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351 * Consider making it possible to specify an empty matrix with a |
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352 syntax like [](e1, e2). Of course at least one of the expressions |
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353 must be zero... |
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354 |
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355 * Is Matrix::fortran_vec() really necessary? |
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356 |
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357 * print_usage() should set error_state in most cases? |
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358 |
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359 * Add a command that works like bash's `builtin' command. |
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360 |
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361 * Handle end-of-line comments correctly in parse trees for use with |
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362 the type command. |
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363 |
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364 * Clean up eye, eval, feval, keyboard, input, ones, zeros. |
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365 |
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366 * It would be nice to have an interactive debugger. |
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367 |
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368 * Make whos report total memory used by variables (and functions?). |
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369 |
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370 * Rewrite whos and the symbol_record_info class. Write a built-in |
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371 function that gives all the basic information, then write who and |
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372 whos as M-files. |
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373 |
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374 * Make whos work for structure elements: |
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375 |
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376 prot type rows cols name |
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377 ==== ==== ==== ==== ==== |
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378 wd matrix m n struct.field |
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379 |
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380 * Allow who to return information as a list of strings. |
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381 |
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382 * On systems that support matherr(), make it possible for users to |
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383 enable the printing of warning messages. |
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384 |
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385 * Make it possible to mark variables and functions as read-only. |
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386 |
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387 * Provide a built-in function for applying a scalar function to an |
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388 array. Be sure to note in the manual that this is not the |
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389 preferred way to write a function that can handle vector/matrix |
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390 arguments because there is a significant overhead for function |
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391 calls. If you are really looking to make a function work for |
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392 vector/matrix arguments and you want it to run fast, you should |
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393 write it in terms of the existing vector/matrix operators as much |
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394 as possible. |
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395 |
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396 * Make it possible to write a function that gets a reference to a |
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397 matrix in memory and change one or more elements without |
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398 generating a second copy of the data. |
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399 |
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400 ------- |
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401 History: |
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402 ------- |
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403 |
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404 * Add an option to allow saving input from script files in the |
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405 history list. |
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406 |
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407 * The history command should accept two numeric arguments to |
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408 indicate a range of history entries to display, save or read. |
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409 |
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410 * Add an option to include information about the Octave session in |
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411 the history list. Possibly a time/date stamp and the current |
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412 Octave line number, appended as a comment (users should probably |
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413 be able to control the format). |
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414 |
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415 * Avoid writing the history file if the history list has not |
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416 changed. |
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417 |
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418 * Avoid permission errors if the history file cannot be opened for |
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419 writing. |
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420 |
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421 * Fix history problems -- core dump if multiple processes are |
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422 writing to the same history file? |
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423 |
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424 ------------------------------ |
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425 Configuration and Installation: |
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426 ------------------------------ |
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427 |
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428 * Add an --enable-pathsearch option to configure to make it possible |
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429 to configure and run without kpathsea. |
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430 |
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431 * Makefile changes: |
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432 -- eliminate for loops |
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433 -- define shell commands or eliminate them |
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434 -- verify distclean |
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435 -- consolidate targets |
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436 |
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437 * Make it possible to configure so that installed binaries and |
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438 shared libraries are stripped. |
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439 |
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440 * Create a docs-only distribution? |
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441 |
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442 ------------------------------ |
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443 Documentation and On-Line Help: |
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444 ------------------------------ |
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445 |
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446 * Document new features. |
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447 -- history-search-{back,for}ward. |
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448 -- Other stuff mentioned in the NEWS file. |
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449 |
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450 * Improve the Texinfo Documentation for the interpreter. It would |
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451 be useful to have lots more examples, to not have so many forward |
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452 references, and to not have very many simple lists of functions. |
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453 |
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454 * The docs should mention something about efficiency and that using |
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455 array operations is almost always a good idea for speed. |
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456 |
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457 * Texinfo documentation for the C++ classes. |
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458 |
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459 * Support multiple info files, perhaps allowing one or more in each |
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460 directory in the LOADPATH, so that local collections of M-files |
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461 could be documented with Info. |
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462 |
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463 * Improve help messages for operators and keywords in help.cc. |
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464 |
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465 * Make index entries more consistent to improve behavior of `help -i'. |
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466 |
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467 * Make `help -i' try to find a whole word match first. |
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468 |
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469 * Allow help for local additions to be accessible with help -i. |
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470 |
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3130
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471 * Clean up help stuff. |
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472 |
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2330
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473 * Demo files. |
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474 |
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475 * As the number of m-files with octave grows perhaps a 'Contents.m' |
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476 file for each toolbox (directory) would be appropriate so one |
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477 knows exactly what functions are in a toolbox with a quick look. |
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478 It would be best to generate information for each function directly |
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479 from the M-files, so that the information doesn't have to be |
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480 duplicated, and will remain current if the M-files change. It |
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481 would also be best to do as much of this as possible in an M-file, |
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482 though I wouldn't mind adding some basic support for listing the |
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483 names of all the directories in the LOADPATH, and the names of all |
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484 the M-files in a given directory if that is needed. |
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485 |
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2787
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486 Also make it possible to recursively search for Contents files: |
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487 |
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488 help dir -- Contents from dir |
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489 help dir// -- Contents from dir and all its subdirectories |
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490 help dir1/dir2 -- Contents from dir2 which is under dir1 |
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491 |
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2330
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492 * Some sort of blurb (2-3 pages) describing Octave in a reasonably |
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493 coherent way, where to get it etc., perhaps formatted pretty, |
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494 i.e. not just text. Maybe start with the latest Announce file. |
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495 |
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496 ----- |
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497 Tests: |
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498 ----- |
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499 |
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500 * Improved set of tests: |
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501 |
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502 -- Tests for various functions. Would be nice to have a test file |
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503 corresponding to every function. |
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504 |
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505 -- Tests for element by element operators: |
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506 + - .* ./ .\ .^ | & < <= == >= > != ! |
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507 |
|
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508 -- Tests for boolean operators: && || |
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509 |
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510 -- Tests for other operators: * / \ ' .' |
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|
511 |
|
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512 -- Tests from bug reports. |
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513 |
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514 -- Tests for indexed assignment. Need to consider the following: |
|
|
515 o fortran-style indexing |
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516 o zero-one indexing |
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517 o assignment of empty matrix as well as values |
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|
518 o resizing |
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519 |
|
|
520 * Tests for all internal functions. |
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521 |
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522 ----------- |
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523 Programming: |
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524 ----------- |
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525 |
|
2475
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526 * Better error messages for missing operators? |
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527 |
|
|
528 * Eliminate duplicate enums in pt-exp.cc, pt-const.cc, and ov.cc. |
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529 |
|
|
530 * Handle octave_print_internal() stuff at the liboctave level. Then |
|
|
531 the octave_value classes could just call on the print() methods |
|
|
532 for the underlying classes. |
|
|
533 |
|
|
534 * As much as possible, eliminate explicit checks for the types of |
|
|
535 octave_value objects so that user-defined types will automatically |
|
|
536 do the right thing in more cases. |
|
|
537 |
|
2330
|
538 * Only include config.h in files that actually need it, instead of |
|
|
539 including it in every .cc file. Unfortunately, this might not be |
|
|
540 so easy to figure out. |
|
|
541 |
|
|
542 * GNU coding standards: |
|
|
543 |
|
|
544 -- Add a `Makefile' target to the Makefiles. |
|
|
545 -- Comments on #else and #endif preprocessor commands. |
|
|
546 -- Change error message format to match standards everywhere. |
|
|
547 |
|
|
548 * Use STL stuff instead of libg++ lists, maps, and stacks. |
|
|
549 |
|
|
550 * Eliminate more global variables. |
|
|
551 |
|
|
552 * Move procstream to liboctave. |
|
|
553 |
|
|
554 * Use references and classes in more places. |
|
|
555 |
|
|
556 * Share more code among the various *_options functions. |
|
|
557 |
|
|
558 ------------- |
|
|
559 Miscellaneous: |
|
|
560 ------------- |
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561 |
|
|
562 * Implement some functions for interprocess communication: bind, |
|
|
563 accept, connect, gethostbyname, etc. |
|
|
564 |
|
2454
|
565 * The installation process should also install octave.el. This |
|
|
566 needs to detect the appropriate Emacs binary to use to |
|
|
567 byte-compile the .el file. Following GNU Emacs philosophy, |
|
|
568 installation would be into $(prefix)/share/emacs/site-lisp by |
|
|
569 default, but it should be selectable. |
|
|
570 |
|
2330
|
571 * The ability to transparently handle very large files: |
|
|
572 |
|
|
573 Juhana K Kouhia <kouhia@nic.funet.fi> wrote: |
|
|
574 |
|
|
575 If I have a one-dimensional signal data with the size 400 |
|
|
576 Mbytes, then what are my choices to operate with it: |
|
|
577 |
|
|
578 * I have to split the data |
|
|
579 * Octave has a virtual memory on its own and I don't have to |
|
|
580 worry about the splitting. |
|
|
581 |
|
|
582 If I split the data, then my easily programmed processing |
|
|
583 programs will become hard to program. |
|
|
584 |
|
|
585 If possible, I would like to have the virtual memory system in |
|
|
586 Octave i.e. the all big files, the user see as one big array or |
|
|
587 such. There could be several user selectable models to do the |
|
|
588 virtual memory depending on what kind of data the user have (1d, |
|
|
589 2d) and in what order they are processed (stream or random |
|
|
590 access). |
|
|
591 |
|
|
592 Perhaps this can be done entirely with a library of M-files. |
|
|
593 |
|
3136
|
594 * An interface to gdb. |
|
|
595 |
|
|
596 Michael Smolsky <fnsiguc@weizmann.weizmann.ac.il> wrote: |
|
|
597 |
|
|
598 I was thinking about a tool, which could be very useful for me |
|
|
599 in my numerical simulation work. It is an interconnection |
|
|
600 between gdb and octave. We are often managing very large arrays |
|
|
601 of data in our fortran or c codes, which might be studied with |
|
|
602 the help of octave at the algorithm development stages. Assume |
|
|
603 you're coding, say, wave equation. And want to debug the |
|
|
604 code. It would be great to pick some array from the memory of |
|
|
605 the code you're develloping, fft it and see the image as a |
|
|
606 log-log plot of the spectral density. I'm facing similar |
|
|
607 problems now. To avoid high c-development cost, I develop in |
|
|
608 matlab/octave, and then rewrite into c. It might be so much |
|
|
609 easier, if I could off-load a c array right from the debugger |
|
|
610 into octave, study it, and, perhaps, change some [many] values |
|
|
611 with a convenient matlab/octave syntax, similar to |
|
|
612 a(:,50:250)=zeros(100,200), and then store it back into the |
|
|
613 memory of my c code. |
|
|
614 |
|
2789
|
615 * Add a definition to lgrind so that it supports Octave. |
|
|
616 (See http://www.tex.ac.uk/tex-archive/support/lgrind/ for more |
|
|
617 information about lgrind.) |
|
|
618 |
|
2330
|
619 ------ |
|
|
620 Always: |
|
|
621 ------ |
|
|
622 |
|
|
623 * Squash bugs. |
|
|
624 |
|
|
625 --30-- |
|
3162
|
626 </pre> |
|
|
627 </html> |
