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| author | Jaroslav Hajek <highegg@gmail.com> |
|---|---|
| date | Fri, 21 Aug 2009 10:13:53 +0200 |
| parents | 588c6bb6fdcb |
| children | 8b3cee6166b8 |
| rev | line source |
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| 9352 | 1 Summary of important user-visible changes for version 3.3: |
| 2 --------------------------------------------------------- | |
| 3 | |
| 4 ** The `lookup' function was extended to be more useful for general-purpose | |
| 5 binary searching. Using this improvement, the ismember function was | |
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6 rewritten for significantly better performance. |
| 9352 | 7 |
| 8 ** Real, integer and logical matrices, when used in indexing, will now | |
| 9 cache the internal index_vector value (zero-based indices) when | |
| 10 successfully used as indices, eliminating the conversion penalty for | |
| 11 subsequent indexing by the same matrix. In particular, this means it is | |
| 12 no longer needed to avoid repeated indexing by logical arrays using | |
| 13 `find' for performance reasons. | |
| 14 | |
| 9480 | 15 ** sub2ind and ind2sub were reimplemented as compiled functions for better |
| 16 performance. These functions are now faster, can deliver more economized | |
| 17 results for ranges, and can reuse the index cache mechanism described in | |
| 18 previous paragraph. | |
| 19 | |
| 9449 | 20 ** The built-in function equivalents to associative operators (plus, times, |
| 21 mtimes, and, or) have been extended to accept multiple arguments. This | |
| 22 is especially useful for summing (multiplying, etc.) lists of objects | |
| 23 (of possibly distinct types): | |
| 9408 | 24 |
| 9449 | 25 matrix_sum = plus (matrix_list{:}); |
| 26 | |
| 27 ** The default behavior of assert (observed, expected) has been relaxed | |
| 28 to employ less strict checking that does not require the internals | |
| 29 of the values to match. This avoids previously valid tests from | |
| 30 breaking due to new internal classes introduced in future Octave | |
| 31 versions. | |
| 32 | |
| 33 For instance, all of these assertions were true in Octave 3.0.x | |
| 34 but false in 3.2.x due to new optimizations and improvements: | |
| 35 | |
| 36 assert (2*linspace (1, 5, 5), 2*(1:5)) | |
| 37 assert (zeros (0, 0), []) | |
| 38 assert (2*ones (1, 5), (2) (ones (1,5))) | |
| 9462 | 39 |
| 40 ** Function handles are now aware of overloaded functions. If a function | |
| 41 is overloaded, the handle determines at the time of its reference which | |
| 42 function to call. A non-overloaded version does not need to exist. | |
| 9408 | 43 |
| 9547 | 44 ** The operation-assignment operators +=, -=, *= and /= now behave more |
| 45 efficiently in certain cases. For instance, if m is a matrix and s | |
| 46 a scalar, then the statement | |
| 47 | |
| 48 m += s; | |
| 49 | |
| 50 will operate on m's data in-place if it is not shared by another variable, | |
| 51 usually increasing both time and memory efficiency. | |
| 52 | |
| 53 Only the most common combinations are affected, namely: | |
| 54 | |
| 55 matrix += matrix | |
| 56 matrix -= matrix | |
| 57 matrix += scalar | |
| 58 matrix -= scalar | |
| 59 matrix *= scalar | |
| 60 matrix /= scalar | |
| 9552 | 61 logical matrix |= logical matrix |
| 62 logical matrix &= logical matrix | |
| 9547 | 63 |
| 64 where matrix and scalar belong to the same class. The left-hand side must be | |
| 65 a simple variable reference. | |
| 66 | |
| 67 | |
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68 Summary of important user-visible changes for version 3.2: |
| 5913 | 69 --------------------------------------------------------- |
| 2452 | 70 |
| 8737 | 71 ** Compatibility with Matlab graphics has been improved. |
| 6329 | 72 |
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73 The hggroup object and associated listener callback functions have |
| 8737 | 74 been added allowing the inclusion of group objects. Data sources |
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75 have been added to these group objects such that |
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76 |
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77 x = 0:0.1:10; |
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78 y = sin (x); |
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79 plot (x, y, "ydatasource", "y"); |
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80 for i = 1 : 100 |
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81 pause(0.1) |
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82 y = sin (x + 0.1 * i); |
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83 refreshdata(); |
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84 endfor |
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85 |
| 8737 | 86 works as expected. This capability has be used to introduce |
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87 stem-series, bar-series, etc., objects for better Matlab |
| 8737 | 88 compatibility. |
| 89 | |
| 90 ** New graphics functions: | |
| 91 | |
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92 addlistener ezcontour gcbo refresh |
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93 addproperty ezcontourf ginput refreshdata |
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94 allchild ezmesh gtext specular |
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95 available_backends ezmeshc intwarning surfl |
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96 backend ezplot ishghandle trisurf |
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97 cla ezplot3 isocolors waitforbuttonpress |
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98 clabel ezpolar isonormals |
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99 comet ezsurf isosurface |
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100 dellistener findall linkprop |
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101 diffuse gcbf plotmatrix |
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102 |
| 8737 | 103 ** New experimental OpenGL/FLTK based plotting system. |
| 104 | |
| 105 An experimental plotting system based on OpenGL and the FLTK | |
| 106 toolkit is now part of Octave. This backend is disabled by | |
| 107 default. You can switch to using it with the command | |
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108 |
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109 backend ("fltk") |
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110 |
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111 for all future figures or for a particular figure with the command |
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112 |
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113 backend (h, "fltk") |
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114 |
| 8737 | 115 where "h" is a valid figure handle. Please note that this backend |
| 116 does not yet support text objects. Obviously, this is a necessary | |
| 117 feature before it can be considered usable. We are looking for | |
| 118 volunteers to help implement this missing feature. | |
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119 |
| 8737 | 120 ** Functions providing direct access to gnuplot have been removed. |
| 121 | |
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122 The functions __gnuplot_plot__, __gnuplot_set__, __gnuplot_raw__, |
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123 __gnuplot_show__, __gnuplot_replot__, __gnuplot_splot__, |
| 8737 | 124 __gnuplot_save_data__ and __gnuplot_send_inline_data__ have been |
| 125 removed from Octave. These function were incompatible with the | |
| 126 high level graphics handle code. | |
| 6329 | 127 |
| 8885 | 128 ** The Control, Finance and Quaternion functions have been removed. |
| 129 | |
| 130 These functions are now available as separate packages from | |
| 131 | |
| 132 http://octave.sourceforge.net/packages.html | |
| 133 | |
| 134 and can be reinstalled using the Octave package manager (see | |
| 135 the pkg function). | |
| 136 | |
| 137 ** Specific sparse matrix functions removed. | |
| 138 | |
| 139 The following functions, which handled only sparse matrices have | |
| 140 been removed. Instead of calling these functions directly, you | |
| 141 should use the corresponding function without the "sp" prefix. | |
| 8737 | 142 |
| 8885 | 143 spatan2 spcumsum spkron spprod |
| 144 spchol spdet splchol spqr | |
| 145 spchol2inv spdiag splu spsum | |
| 146 spcholinv spfind spmax spsumsqk | |
| 147 spcumprod spinv spmin | |
| 148 | |
| 149 ** Improvements to the debugger. | |
| 150 | |
| 151 The interactive debugging features have been improved. Stopping | |
| 152 on statements with dbstop should work correctly now. Stepping | |
| 153 into and over functions, and stepping one statement at a time | |
| 154 (with dbstep) now works. Moving up and down the call stack with | |
| 155 dbup and dbdown now works. The dbstack function is now available | |
| 156 to print the current function call stack. The new dbquit function | |
| 157 is available to exit the debugging mode. | |
| 158 | |
| 159 ** Improved traceback error messages. | |
| 160 | |
| 161 Traceback error messages are much more concise and easier to | |
| 162 understand. They now display information about the function call | |
| 163 stack instead of the stack of all statements that were active at | |
| 164 the point of the error. | |
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165 |
| 8737 | 166 ** Object Oriented Programming. |
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167 |
| 8737 | 168 Octave now includes OOP features and the user can create their own |
| 169 class objects and overloaded functions and operators. For | |
| 170 example, all methods of a class called "myclass" will be found in | |
| 171 a directory "@myclass" on the users path. The class specific | |
| 172 versions of functions and operators take precedence over the | |
| 173 generic versions of these functions. | |
| 174 | |
| 175 New functions related to OOP include | |
| 7189 | 176 |
| 8737 | 177 class inferiorto isobject loadobj methods superiorto |
| 178 | |
| 179 See the Octave manual for more details. | |
| 7038 | 180 |
| 8747 | 181 ** Parsing of Command-style Functions. |
| 182 | |
| 183 Octave now parses command-style functions without needing to first | |
| 184 declare them with "mark_as_command". The rules for recognizing a | |
| 185 command-style function calls are | |
| 186 | |
| 187 * A command must appear as the first word in a statement, | |
| 188 followed by a space. | |
| 189 | |
| 190 * The first character after the space must not be '=' or '(' | |
| 191 | |
| 192 * The next token after the space must not look like a binary | |
| 193 operator. | |
| 194 | |
| 195 These rules should be mostly compatible with the way Matlab parses | |
| 196 command-style function calls and allow users to define commands in | |
| 197 .m files without having to mark them as commands. | |
| 198 | |
| 199 Note that previous versions of Octave allowed expressions like | |
| 200 | |
| 201 x = load -text foo.dat | |
| 202 | |
| 203 but an expression like this will now generate a parse error. In | |
| 204 order to assign the value returned by a function to a variable, | |
| 205 you must use the normal function call syntax: | |
| 206 | |
| 207 x = load ("-text", "foo.dat"); | |
| 208 | |
| 8737 | 209 ** Block comments. |
| 210 | |
| 8747 | 211 Commented code can be between matching "#{" and "#}" or "%{" and |
| 212 "%}" markers, even if the commented code spans several line. This | |
| 213 allows blocks code to be commented, without needing to comment | |
| 214 each line. For example, | |
| 5814 | 215 |
| 8747 | 216 function [s, t] = func (x, y) |
| 217 s = 2 * x; | |
| 218 #{ | |
| 219 s *= y; | |
| 220 t = y + x; | |
| 221 #} | |
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222 endfunction |
| 5814 | 223 |
| 8747 | 224 the lines "s *= y;" and "t = y + x" will not be executed. |
| 8737 | 225 |
| 226 ** Special treatment in the parser of expressions like "a' * b". | |
| 2452 | 227 |
| 8737 | 228 In these cases the transpose is no longer explicitly formed and |
| 229 BLAS libraries are called with the transpose flagged, | |
| 230 significantly improving performance for these kinds of | |
| 231 operations. | |
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232 |
| 8737 | 233 ** Single Precision data type. |
| 2452 | 234 |
| 8737 | 235 Octave now includes a single precision data type. Single |
| 236 precision variables can be created with the "single" command, or | |
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237 from functions like ones, eye, etc. For example, |
| 5995 | 238 |
| 8737 | 239 single (1) |
| 240 ones (2, 2, "single") | |
| 241 zeros (2, 2, "single") | |
| 242 eye (2, 2, "single") | |
| 243 Inf (2, 2, "single") | |
| 244 NaN (2, 2, "single") | |
| 245 NA (2, 2, "single") | |
| 7279 | 246 |
| 8737 | 247 all create single precision variables. For compatibility with |
| 248 Matlab, mixed double/single precision operators and functions | |
| 249 return single precision types. | |
| 250 | |
| 251 As a consequence of this addition to Octave the internal | |
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252 representation of the double precision NA value has changed, and |
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253 so users that make use of data generated by Octave with R or |
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254 visa-versa are warned that compatibility might not be assured. |
| 7279 | 255 |
| 8737 | 256 ** Improved array indexing. |
| 257 | |
| 258 The underlying code used for indexing of arrays has been | |
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259 completely rewritten and indexing is now significantly faster. |
| 8737 | 260 |
| 8755 | 261 ** Improved memory management. |
| 262 | |
| 263 Octave will now attempt to share data in some cases where previously | |
| 264 a copy would be made, such as certain array slicing operations or | |
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265 conversions between cells, structs and cs-lists. This usually reduces |
| 8755 | 266 both time and memory consumption. |
| 9128 | 267 Also, Octave will now attempt to detect and optimize usage of a vector |
| 268 as a stack, when elements are being repeatedly inserted at/removed from | |
| 269 the end of the vector. | |
| 8755 | 270 |
| 8738 | 271 ** Improved performance for reduction operations. |
| 272 | |
| 8755 | 273 The performance of the sum, prod, sumsq, cumsum, cumprod, any, all, |
| 274 max and min functions has been significantly improved. | |
| 8738 | 275 |
| 9006 | 276 ** Sorting and searching. |
| 277 | |
| 278 The performance of sort has been improved, especially when sorting | |
| 279 indices are requested. An efficient built-in issorted implementation | |
| 280 was added. sortrows now uses a more efficient algorithm, especially | |
| 281 in the homegeneous case. lookup is now a built-in function performing | |
| 282 a binary search, optimized for long runs of close elements. Lookup | |
| 283 also works with cell arrays of strings. | |
| 284 | |
| 285 ** Range arithmetics | |
| 286 | |
| 287 For some operations on ranges, Octave will attempt to keep the result as a | |
| 288 range. These include negation, adding a scalar, subtracting a scalar, and | |
| 289 multiplying by a scalar. Ranges with zero increment are allowed and can be | |
| 290 constructed using the built-in function `ones'. | |
| 291 | |
| 292 ** Various performance improvements. | |
| 293 | |
| 294 Performance of a number of other built-in operations and functions was | |
| 295 improved, including: | |
| 296 | |
| 297 * logical operations | |
| 298 * comparison operators | |
| 299 * element-wise power | |
| 300 * accumarray | |
| 301 * cellfun | |
| 302 * isnan | |
| 303 * isinf | |
| 304 * isfinite | |
| 305 * nchoosek | |
| 306 * repmat | |
| 307 * strcmp | |
| 308 | |
| 8737 | 309 ** 64-bit integer arithmetic. |
| 310 | |
| 311 Arithmetic with 64-bit integers (int64 and uint64 types) is fully | |
| 312 supported, with saturation semantics like the other integer types. | |
| 313 Performance of most integer arithmetic operations has been | |
| 314 improved by using integer arithmetic directly. Previously, Octave | |
| 315 performed integer math with saturation semantics by converting the | |
| 316 operands to double precision, performing the operation, and then | |
| 317 converting the result back to an integer value, truncating if | |
| 318 necessary. | |
| 319 | |
| 8885 | 320 ** Diagonal and permutation matrices. |
| 321 | |
| 322 The interpreter can now treat diagonal and permutation matrices as | |
| 323 special objects that store only the non-zero elements, rather than | |
| 324 general full matrices. Therefore, it is now possible to construct | |
| 325 and use these matrices in linear algebra without suffering a | |
| 326 performance penalty due to storing large numbers of zero elements. | |
| 327 | |
| 328 ** Improvements to fsolve. | |
| 329 | |
| 330 The fsolve function now accepts an option structure argument (see | |
| 331 also the optimset function). The INFO values returned from fsolve | |
| 332 have changed to be compatible with Matlab's fsolve function. | |
| 333 Additionally, fsolve is now able to solve overdetermined systems, | |
| 334 complex-differentiable complex systems, systems with a sparse | |
| 335 jacobian and can work in single precision if given single precision | |
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336 inputs. It can also be called recursively. |
| 8885 | 337 |
| 8737 | 338 ** Improvements to the norm function. |
| 339 | |
| 340 The norm function is now able to compute row or column norms of a | |
| 341 matrix in a single call, as well as general matrix p-norms. | |
| 342 | |
| 343 ** New functions for computing some eigenvalues or singular values. | |
| 344 | |
| 345 The eigs and svds functions have been included in Octave. These | |
| 346 functions require the ARPACK library (now distributed under a | |
| 347 GPL-compatible license). | |
| 348 | |
| 349 ** New QR and Cholesky factorization updating functions. | |
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350 |
| 8737 | 351 choldelete cholshift qrdelete qrshift |
| 352 cholinsert cholupdate qrinsert qrupdate | |
| 353 | |
| 354 ** New quadrature functions. | |
| 355 | |
| 356 dblquad quadgk quadv triplequad | |
| 357 | |
| 8885 | 358 ** New functions for reading and writing images. |
| 359 | |
| 360 The imwrite and imread functions have been included in Octave. | |
| 361 These functions require the GraphicsMagick library. The new | |
| 362 function imfinfo provides information about an image file (size, | |
| 363 type, colors, etc.) | |
| 364 | |
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365 ** The input_event_hook function has been replaced by the pair of |
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366 functions add_input_event_hook and remove_input_event_hook so that |
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367 more than one hook function may be installed at a time. |
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368 |
| 8737 | 369 ** Other miscellaneous new functions. |
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370 |
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371 addtodate hypot reallog |
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372 bicgstab idivide realpow |
| 9006 | 373 cellslices info realsqrt |
| 374 cgs interp1q rectint | |
| 375 command_line_path isdebugmode regexptranslate | |
| 376 contrast isfloat restoredefaultpath | |
| 377 convn isstrprop roundb | |
| 378 cummin log1p rundemos | |
| 379 cummax lsqnonneg runlength | |
| 380 datetick matlabroot saveobj | |
| 381 display namelengthmax spaugment | |
| 382 expm1 nargoutchk strchr | |
| 383 filemarker pathdef strvcat | |
| 384 fstat perl subspace | |
| 385 full prctile symvar | |
| 386 fzero quantile treelayout | |
| 387 genvarname re_read_readline_init_file validatestring | |
| 388 histc | |
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389 |
| 8885 | 390 ** Changes to strcat. |
| 391 | |
| 392 The strcat function is now compatible with Matlab's strcat | |
| 393 function, which removes trailing whitespace when concatenating | |
| 394 character strings. For example | |
| 395 | |
| 396 strcat ('foo ', 'bar') | |
| 397 ==> 'foobar' | |
| 398 | |
| 399 The new function cstrcat provides the previous behavior of | |
| 400 Octave's strcat. | |
| 401 | |
| 402 ** Improvements to the help functions. | |
| 403 | |
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404 The help system has been mostly re-implemented in .m files to make |
| 8885 | 405 it easier to modify. Performance of the lookfor function has been |
| 406 greatly improved by caching the help text from all functions that | |
| 407 are distributed with Octave. The pkg function has been modified | |
| 408 to generate cache files for external packages when they are | |
| 409 installed. | |
| 410 | |
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411 ** Deprecated functions. |
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412 |
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413 The following functions were deprecated in Octave 3.0 and will be |
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414 removed in Octave 3.4 (or whatever version is the second major |
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415 release after 3.0): |
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416 |
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417 beta_cdf geometric_pdf pascal_pdf |
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418 beta_inv geometric_rnd pascal_rnd |
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419 beta_pdf hypergeometric_cdf poisson_cdf |
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420 beta_rnd hypergeometric_inv poisson_inv |
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421 binomial_cdf hypergeometric_pdf poisson_pdf |
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422 binomial_inv hypergeometric_rnd poisson_rnd |
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423 binomial_pdf intersection polyinteg |
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424 binomial_rnd is_bool setstr |
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425 chisquare_cdf is_complex struct_contains |
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426 chisquare_inv is_list struct_elements |
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427 chisquare_pdf is_matrix t_cdf |
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428 chisquare_rnd is_scalar t_inv |
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429 clearplot is_square t_pdf |
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430 clg is_stream t_rnd |
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431 com2str is_struct uniform_cdf |
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432 exponential_cdf is_symmetric uniform_inv |
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433 exponential_inv is_vector uniform_pdf |
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434 exponential_pdf isstr uniform_rnd |
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435 exponential_rnd lognormal_cdf weibcdf |
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436 f_cdf lognormal_inv weibinv |
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437 f_inv lognormal_pdf weibpdf |
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438 f_pdf lognormal_rnd weibrnd |
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439 f_rnd meshdom weibull_cdf |
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440 gamma_cdf normal_cdf weibull_inv |
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441 gamma_inv normal_inv weibull_pdf |
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442 gamma_pdf normal_pdf weibull_rnd |
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443 gamma_rnd normal_rnd wiener_rnd |
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444 geometric_cdf pascal_cdf |
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445 geometric_inv pascal_inv |
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446 |
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447 The following functions are now deprecated in Octave 3.2 and will |
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448 be removed in Octave 3.6 (or whatever version is the second major |
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449 release after 3.2): |
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450 |
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451 create_set spcholinv spmax |
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452 dmult spcumprod spmin |
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453 iscommand spcumsum spprod |
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454 israwcommand spdet spqr |
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455 lchol spdiag spsum |
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456 loadimage spfind spsumsq |
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457 mark_as_command spinv str2mat |
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458 mark_as_rawcommand spkron unmark_command |
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459 spatan2 splchol unmark_rawcommand |
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460 spchol split |
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461 spchol2inv splu |
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462 |
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463 See NEWS.3 for old news. |