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| author | Jaroslav Hajek <highegg@gmail.com> |
|---|---|
| date | Wed, 18 Nov 2009 11:17:54 +0100 |
| parents | cfd0aa788ae1 |
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| rev | line source |
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| 9352 | 1 Summary of important user-visible changes for version 3.3: |
| 2 --------------------------------------------------------- | |
| 3 | |
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4 ** BLAS and LAPACK libraries are now required to build Octave. The |
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5 subset of the reference BLAS and LAPACK libraries has been removed |
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6 from the Octave sources. |
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7 |
| 9352 | 8 ** The `lookup' function was extended to be more useful for general-purpose |
| 9 binary searching. Using this improvement, the ismember function was | |
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10 rewritten for significantly better performance. |
| 9352 | 11 |
| 12 ** Real, integer and logical matrices, when used in indexing, will now | |
| 13 cache the internal index_vector value (zero-based indices) when | |
| 14 successfully used as indices, eliminating the conversion penalty for | |
| 15 subsequent indexing by the same matrix. In particular, this means it is | |
| 16 no longer needed to avoid repeated indexing by logical arrays using | |
| 17 `find' for performance reasons. | |
| 18 | |
| 9480 | 19 ** sub2ind and ind2sub were reimplemented as compiled functions for better |
| 20 performance. These functions are now faster, can deliver more economized | |
| 21 results for ranges, and can reuse the index cache mechanism described in | |
| 22 previous paragraph. | |
| 23 | |
| 9449 | 24 ** The built-in function equivalents to associative operators (plus, times, |
| 25 mtimes, and, or) have been extended to accept multiple arguments. This | |
| 26 is especially useful for summing (multiplying, etc.) lists of objects | |
| 27 (of possibly distinct types): | |
| 9408 | 28 |
| 9449 | 29 matrix_sum = plus (matrix_list{:}); |
| 30 | |
| 31 ** The default behavior of assert (observed, expected) has been relaxed | |
| 32 to employ less strict checking that does not require the internals | |
| 33 of the values to match. This avoids previously valid tests from | |
| 34 breaking due to new internal classes introduced in future Octave | |
| 35 versions. | |
| 36 | |
| 37 For instance, all of these assertions were true in Octave 3.0.x | |
| 38 but false in 3.2.x due to new optimizations and improvements: | |
| 39 | |
| 40 assert (2*linspace (1, 5, 5), 2*(1:5)) | |
| 41 assert (zeros (0, 0), []) | |
| 42 assert (2*ones (1, 5), (2) (ones (1,5))) | |
| 9462 | 43 |
| 44 ** Function handles are now aware of overloaded functions. If a function | |
| 45 is overloaded, the handle determines at the time of its reference which | |
| 46 function to call. A non-overloaded version does not need to exist. | |
| 9408 | 47 |
| 9547 | 48 ** The operation-assignment operators +=, -=, *= and /= now behave more |
| 49 efficiently in certain cases. For instance, if m is a matrix and s | |
| 50 a scalar, then the statement | |
| 51 | |
| 52 m += s; | |
| 53 | |
| 54 will operate on m's data in-place if it is not shared by another variable, | |
| 55 usually increasing both time and memory efficiency. | |
| 56 | |
| 9558 | 57 Only selected common combinations are affected, namely: |
| 9547 | 58 |
| 59 matrix += matrix | |
| 60 matrix -= matrix | |
| 9558 | 61 matrix .*= matrix |
| 62 matrix ./= matrix | |
| 63 | |
| 9547 | 64 matrix += scalar |
| 65 matrix -= scalar | |
| 66 matrix *= scalar | |
| 67 matrix /= scalar | |
| 9558 | 68 |
| 9552 | 69 logical matrix |= logical matrix |
| 70 logical matrix &= logical matrix | |
| 9547 | 71 |
| 72 where matrix and scalar belong to the same class. The left-hand side must be | |
| 73 a simple variable reference. | |
| 9589 | 74 |
| 75 ** The effect of comparison operators (<,>,<=,>=) when applied to complex numbers | |
| 76 has changed to be consistent with the strict ordering defined by max, min and sort. | |
| 77 More specifically, complex numbers are compared by lexicographical comparison of | |
| 78 the pairs [abs(z), arg(z)]. Previously, only real parts were compared; this can be | |
| 79 trivially achieved by wrapping the operands in real(). | |
| 9547 | 80 |
| 9826 | 81 ** The automatic simplification of complex computation results has changed. Octave will |
| 82 now simplify any complex number with a zero imaginary part or any complex matrix | |
| 83 with all elements having zero imaginary part to a real value. Previously, this was done | |
| 84 only for positive zeros. | |
| 85 Note that the behavior of the `complex' function is unchanged and it still | |
| 86 produces a complex value even if the imaginary part is zero. | |
| 87 | |
| 9595 | 88 ** As a side effect of code refactoring in liboctave, the binary logical operations |
| 89 are now more easily amenable to compiler optimizations and are thus significantly | |
| 90 faster. | |
| 91 | |
| 92 ** Octave now allows user-defined subsasgn methods to optimize out redundant copies. | |
| 93 For more information, see the manual. | |
| 94 | |
| 9664 | 95 ** More efficient matrix division handling. Octave is now able to handle the expressions |
| 96 | |
| 97 M' \ v | |
| 98 M.' \ v | |
| 99 v / M | |
| 100 | |
| 101 (M is a matrix and v is a vector) more efficiently in certain cases. | |
| 102 In particular, if M is triangular, all three expressions will be handled by a single call to | |
| 103 xTRTRS, with appropriate flags. Previously, all three expressions required a physical transpose | |
| 104 of M. | |
| 105 | |
| 106 ** More efficient handling of certain mixed real-complex matrix operations. | |
| 107 For instance, if RM is a real matrix and CM a complex matrix, | |
| 108 | |
| 109 RM * CM | |
| 110 | |
| 111 can now be evaluated either as | |
| 112 | |
| 113 complex (RM * real (CM), RM * imag (CM)) | |
| 114 | |
| 115 or as | |
| 116 | |
| 117 complex (RM) * CM, | |
| 118 | |
| 119 depending on the dimensions. The 1st form requires more temporaries and copying, | |
| 120 but halves the count of FLOPs, which normally brings better performance if | |
| 121 RM has enough rows. Previously, the 2nd form was always used. | |
| 122 | |
| 123 Matrix division is similarly affected. | |
| 124 | |
| 9717 | 125 ** More efficient handling of triangular matrix factors returned from factorizations. |
| 126 The functions for computing QR, LU and Cholesky factorizations will now automatically | |
| 127 return the triangular matrix factors with proper internal matrix_type set, so that it | |
| 128 won't need to be computed when the matrix is used for division. | |
| 129 | |
| 9722 | 130 ** The built-in "sum" function now handles the non-native summation (i.e. double precision |
| 131 sum of single or integer inputs) more efficiently, avoiding a temporary conversion of | |
| 132 the whole input array to doubles. Further, "sum" can now accept an "extra" option argument, | |
| 133 using a compensated summation algorithm rather than a straightforward sum, which significantly | |
| 134 improves precision if lots of cancellation occurs in the summation. | |
| 9717 | 135 |
| 9745 | 136 ** The built-in "bsxfun" function now uses optimized code for certain cases where built-in |
| 137 operator handles are passed in. Namely, the optimizations concern the operators | |
| 138 plus, minus, times, ldivide, rdivide, and, or (for logical arrays), the relational | |
| 139 operators eq, ne, lt, le, gt, ge, and the functions min and max. | |
| 140 Optimizations only apply when both operands are of the same built-in class | |
| 141 (or one is single and the other is double). | |
| 142 | |
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143 Summary of important user-visible changes for version 3.2: |
| 5913 | 144 --------------------------------------------------------- |
| 2452 | 145 |
| 8737 | 146 ** Compatibility with Matlab graphics has been improved. |
| 6329 | 147 |
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148 The hggroup object and associated listener callback functions have |
| 8737 | 149 been added allowing the inclusion of group objects. Data sources |
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150 have been added to these group objects such that |
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151 |
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152 x = 0:0.1:10; |
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153 y = sin (x); |
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154 plot (x, y, "ydatasource", "y"); |
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155 for i = 1 : 100 |
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156 pause(0.1) |
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157 y = sin (x + 0.1 * i); |
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158 refreshdata(); |
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159 endfor |
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160 |
| 8737 | 161 works as expected. This capability has be used to introduce |
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162 stem-series, bar-series, etc., objects for better Matlab |
| 8737 | 163 compatibility. |
| 164 | |
| 165 ** New graphics functions: | |
| 166 | |
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167 addlistener ezcontour gcbo refresh |
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168 addproperty ezcontourf ginput refreshdata |
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169 allchild ezmesh gtext specular |
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170 available_backends ezmeshc intwarning surfl |
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171 backend ezplot ishghandle trisurf |
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172 cla ezplot3 isocolors waitforbuttonpress |
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173 clabel ezpolar isonormals |
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174 comet ezsurf isosurface |
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175 dellistener findall linkprop |
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176 diffuse gcbf plotmatrix |
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177 |
| 8737 | 178 ** New experimental OpenGL/FLTK based plotting system. |
| 179 | |
| 180 An experimental plotting system based on OpenGL and the FLTK | |
| 181 toolkit is now part of Octave. This backend is disabled by | |
| 182 default. You can switch to using it with the command | |
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183 |
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184 backend ("fltk") |
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185 |
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186 for all future figures or for a particular figure with the command |
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187 |
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188 backend (h, "fltk") |
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189 |
| 8737 | 190 where "h" is a valid figure handle. Please note that this backend |
| 191 does not yet support text objects. Obviously, this is a necessary | |
| 192 feature before it can be considered usable. We are looking for | |
| 193 volunteers to help implement this missing feature. | |
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194 |
| 8737 | 195 ** Functions providing direct access to gnuplot have been removed. |
| 196 | |
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197 The functions __gnuplot_plot__, __gnuplot_set__, __gnuplot_raw__, |
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198 __gnuplot_show__, __gnuplot_replot__, __gnuplot_splot__, |
| 8737 | 199 __gnuplot_save_data__ and __gnuplot_send_inline_data__ have been |
| 200 removed from Octave. These function were incompatible with the | |
| 201 high level graphics handle code. | |
| 6329 | 202 |
| 8885 | 203 ** The Control, Finance and Quaternion functions have been removed. |
| 204 | |
| 205 These functions are now available as separate packages from | |
| 206 | |
| 207 http://octave.sourceforge.net/packages.html | |
| 208 | |
| 209 and can be reinstalled using the Octave package manager (see | |
| 210 the pkg function). | |
| 211 | |
| 212 ** Specific sparse matrix functions removed. | |
| 213 | |
| 214 The following functions, which handled only sparse matrices have | |
| 215 been removed. Instead of calling these functions directly, you | |
| 216 should use the corresponding function without the "sp" prefix. | |
| 8737 | 217 |
| 8885 | 218 spatan2 spcumsum spkron spprod |
| 219 spchol spdet splchol spqr | |
| 220 spchol2inv spdiag splu spsum | |
| 221 spcholinv spfind spmax spsumsqk | |
| 222 spcumprod spinv spmin | |
| 223 | |
| 224 ** Improvements to the debugger. | |
| 225 | |
| 226 The interactive debugging features have been improved. Stopping | |
| 227 on statements with dbstop should work correctly now. Stepping | |
| 228 into and over functions, and stepping one statement at a time | |
| 229 (with dbstep) now works. Moving up and down the call stack with | |
| 230 dbup and dbdown now works. The dbstack function is now available | |
| 231 to print the current function call stack. The new dbquit function | |
| 232 is available to exit the debugging mode. | |
| 233 | |
| 234 ** Improved traceback error messages. | |
| 235 | |
| 236 Traceback error messages are much more concise and easier to | |
| 237 understand. They now display information about the function call | |
| 238 stack instead of the stack of all statements that were active at | |
| 239 the point of the error. | |
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240 |
| 8737 | 241 ** Object Oriented Programming. |
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242 |
| 8737 | 243 Octave now includes OOP features and the user can create their own |
| 244 class objects and overloaded functions and operators. For | |
| 245 example, all methods of a class called "myclass" will be found in | |
| 246 a directory "@myclass" on the users path. The class specific | |
| 247 versions of functions and operators take precedence over the | |
| 248 generic versions of these functions. | |
| 249 | |
| 250 New functions related to OOP include | |
| 7189 | 251 |
| 8737 | 252 class inferiorto isobject loadobj methods superiorto |
| 253 | |
| 254 See the Octave manual for more details. | |
| 7038 | 255 |
| 8747 | 256 ** Parsing of Command-style Functions. |
| 257 | |
| 258 Octave now parses command-style functions without needing to first | |
| 259 declare them with "mark_as_command". The rules for recognizing a | |
| 260 command-style function calls are | |
| 261 | |
| 262 * A command must appear as the first word in a statement, | |
| 263 followed by a space. | |
| 264 | |
| 265 * The first character after the space must not be '=' or '(' | |
| 266 | |
| 267 * The next token after the space must not look like a binary | |
| 268 operator. | |
| 269 | |
| 270 These rules should be mostly compatible with the way Matlab parses | |
| 271 command-style function calls and allow users to define commands in | |
| 272 .m files without having to mark them as commands. | |
| 273 | |
| 274 Note that previous versions of Octave allowed expressions like | |
| 275 | |
| 276 x = load -text foo.dat | |
| 277 | |
| 278 but an expression like this will now generate a parse error. In | |
| 279 order to assign the value returned by a function to a variable, | |
| 280 you must use the normal function call syntax: | |
| 281 | |
| 282 x = load ("-text", "foo.dat"); | |
| 283 | |
| 8737 | 284 ** Block comments. |
| 285 | |
| 8747 | 286 Commented code can be between matching "#{" and "#}" or "%{" and |
| 287 "%}" markers, even if the commented code spans several line. This | |
| 288 allows blocks code to be commented, without needing to comment | |
| 289 each line. For example, | |
| 5814 | 290 |
| 8747 | 291 function [s, t] = func (x, y) |
| 292 s = 2 * x; | |
| 293 #{ | |
| 294 s *= y; | |
| 295 t = y + x; | |
| 296 #} | |
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297 endfunction |
| 5814 | 298 |
| 8747 | 299 the lines "s *= y;" and "t = y + x" will not be executed. |
| 8737 | 300 |
| 301 ** Special treatment in the parser of expressions like "a' * b". | |
| 2452 | 302 |
| 8737 | 303 In these cases the transpose is no longer explicitly formed and |
| 304 BLAS libraries are called with the transpose flagged, | |
| 305 significantly improving performance for these kinds of | |
| 306 operations. | |
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307 |
| 8737 | 308 ** Single Precision data type. |
| 2452 | 309 |
| 8737 | 310 Octave now includes a single precision data type. Single |
| 311 precision variables can be created with the "single" command, or | |
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312 from functions like ones, eye, etc. For example, |
| 5995 | 313 |
| 8737 | 314 single (1) |
| 315 ones (2, 2, "single") | |
| 316 zeros (2, 2, "single") | |
| 317 eye (2, 2, "single") | |
| 318 Inf (2, 2, "single") | |
| 319 NaN (2, 2, "single") | |
| 320 NA (2, 2, "single") | |
| 7279 | 321 |
| 8737 | 322 all create single precision variables. For compatibility with |
| 323 Matlab, mixed double/single precision operators and functions | |
| 324 return single precision types. | |
| 325 | |
| 326 As a consequence of this addition to Octave the internal | |
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327 representation of the double precision NA value has changed, and |
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328 so users that make use of data generated by Octave with R or |
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329 visa-versa are warned that compatibility might not be assured. |
| 7279 | 330 |
| 8737 | 331 ** Improved array indexing. |
| 332 | |
| 333 The underlying code used for indexing of arrays has been | |
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334 completely rewritten and indexing is now significantly faster. |
| 8737 | 335 |
| 8755 | 336 ** Improved memory management. |
| 337 | |
| 338 Octave will now attempt to share data in some cases where previously | |
| 339 a copy would be made, such as certain array slicing operations or | |
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340 conversions between cells, structs and cs-lists. This usually reduces |
| 8755 | 341 both time and memory consumption. |
| 9128 | 342 Also, Octave will now attempt to detect and optimize usage of a vector |
| 343 as a stack, when elements are being repeatedly inserted at/removed from | |
| 344 the end of the vector. | |
| 8755 | 345 |
| 8738 | 346 ** Improved performance for reduction operations. |
| 347 | |
| 8755 | 348 The performance of the sum, prod, sumsq, cumsum, cumprod, any, all, |
| 349 max and min functions has been significantly improved. | |
| 8738 | 350 |
| 9006 | 351 ** Sorting and searching. |
| 352 | |
| 353 The performance of sort has been improved, especially when sorting | |
| 354 indices are requested. An efficient built-in issorted implementation | |
| 355 was added. sortrows now uses a more efficient algorithm, especially | |
| 356 in the homegeneous case. lookup is now a built-in function performing | |
| 357 a binary search, optimized for long runs of close elements. Lookup | |
| 358 also works with cell arrays of strings. | |
| 359 | |
| 360 ** Range arithmetics | |
| 361 | |
| 362 For some operations on ranges, Octave will attempt to keep the result as a | |
| 363 range. These include negation, adding a scalar, subtracting a scalar, and | |
| 364 multiplying by a scalar. Ranges with zero increment are allowed and can be | |
| 365 constructed using the built-in function `ones'. | |
| 366 | |
| 367 ** Various performance improvements. | |
| 368 | |
| 369 Performance of a number of other built-in operations and functions was | |
| 370 improved, including: | |
| 371 | |
| 372 * logical operations | |
| 373 * comparison operators | |
| 374 * element-wise power | |
| 375 * accumarray | |
| 376 * cellfun | |
| 377 * isnan | |
| 378 * isinf | |
| 379 * isfinite | |
| 380 * nchoosek | |
| 381 * repmat | |
| 382 * strcmp | |
| 383 | |
| 8737 | 384 ** 64-bit integer arithmetic. |
| 385 | |
| 386 Arithmetic with 64-bit integers (int64 and uint64 types) is fully | |
| 387 supported, with saturation semantics like the other integer types. | |
| 388 Performance of most integer arithmetic operations has been | |
| 389 improved by using integer arithmetic directly. Previously, Octave | |
| 390 performed integer math with saturation semantics by converting the | |
| 391 operands to double precision, performing the operation, and then | |
| 392 converting the result back to an integer value, truncating if | |
| 393 necessary. | |
| 394 | |
| 8885 | 395 ** Diagonal and permutation matrices. |
| 396 | |
| 397 The interpreter can now treat diagonal and permutation matrices as | |
| 398 special objects that store only the non-zero elements, rather than | |
| 399 general full matrices. Therefore, it is now possible to construct | |
| 400 and use these matrices in linear algebra without suffering a | |
| 401 performance penalty due to storing large numbers of zero elements. | |
| 402 | |
| 403 ** Improvements to fsolve. | |
| 404 | |
| 405 The fsolve function now accepts an option structure argument (see | |
| 406 also the optimset function). The INFO values returned from fsolve | |
| 407 have changed to be compatible with Matlab's fsolve function. | |
| 408 Additionally, fsolve is now able to solve overdetermined systems, | |
| 409 complex-differentiable complex systems, systems with a sparse | |
| 410 jacobian and can work in single precision if given single precision | |
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411 inputs. It can also be called recursively. |
| 8885 | 412 |
| 8737 | 413 ** Improvements to the norm function. |
| 414 | |
| 415 The norm function is now able to compute row or column norms of a | |
| 416 matrix in a single call, as well as general matrix p-norms. | |
| 417 | |
| 418 ** New functions for computing some eigenvalues or singular values. | |
| 419 | |
| 420 The eigs and svds functions have been included in Octave. These | |
| 421 functions require the ARPACK library (now distributed under a | |
| 422 GPL-compatible license). | |
| 423 | |
| 424 ** New QR and Cholesky factorization updating functions. | |
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425 |
| 8737 | 426 choldelete cholshift qrdelete qrshift |
| 427 cholinsert cholupdate qrinsert qrupdate | |
| 428 | |
| 429 ** New quadrature functions. | |
| 430 | |
| 431 dblquad quadgk quadv triplequad | |
| 432 | |
| 8885 | 433 ** New functions for reading and writing images. |
| 434 | |
| 435 The imwrite and imread functions have been included in Octave. | |
| 436 These functions require the GraphicsMagick library. The new | |
| 437 function imfinfo provides information about an image file (size, | |
| 438 type, colors, etc.) | |
| 439 | |
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440 ** The input_event_hook function has been replaced by the pair of |
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441 functions add_input_event_hook and remove_input_event_hook so that |
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442 more than one hook function may be installed at a time. |
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443 |
| 8737 | 444 ** Other miscellaneous new functions. |
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445 |
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446 addtodate hypot reallog |
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447 bicgstab idivide realpow |
| 9006 | 448 cellslices info realsqrt |
| 449 cgs interp1q rectint | |
| 450 command_line_path isdebugmode regexptranslate | |
| 451 contrast isfloat restoredefaultpath | |
| 452 convn isstrprop roundb | |
| 453 cummin log1p rundemos | |
| 454 cummax lsqnonneg runlength | |
| 455 datetick matlabroot saveobj | |
| 456 display namelengthmax spaugment | |
| 457 expm1 nargoutchk strchr | |
| 458 filemarker pathdef strvcat | |
| 459 fstat perl subspace | |
| 460 full prctile symvar | |
| 461 fzero quantile treelayout | |
| 462 genvarname re_read_readline_init_file validatestring | |
| 463 histc | |
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464 |
| 8885 | 465 ** Changes to strcat. |
| 466 | |
| 467 The strcat function is now compatible with Matlab's strcat | |
| 468 function, which removes trailing whitespace when concatenating | |
| 469 character strings. For example | |
| 470 | |
| 471 strcat ('foo ', 'bar') | |
| 472 ==> 'foobar' | |
| 473 | |
| 474 The new function cstrcat provides the previous behavior of | |
| 475 Octave's strcat. | |
| 476 | |
| 477 ** Improvements to the help functions. | |
| 478 | |
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479 The help system has been mostly re-implemented in .m files to make |
| 8885 | 480 it easier to modify. Performance of the lookfor function has been |
| 481 greatly improved by caching the help text from all functions that | |
| 482 are distributed with Octave. The pkg function has been modified | |
| 483 to generate cache files for external packages when they are | |
| 484 installed. | |
| 485 | |
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486 ** Deprecated functions. |
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487 |
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488 The following functions were deprecated in Octave 3.0 and will be |
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489 removed in Octave 3.4 (or whatever version is the second major |
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490 release after 3.0): |
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491 |
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492 beta_cdf geometric_pdf pascal_pdf |
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493 beta_inv geometric_rnd pascal_rnd |
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494 beta_pdf hypergeometric_cdf poisson_cdf |
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495 beta_rnd hypergeometric_inv poisson_inv |
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496 binomial_cdf hypergeometric_pdf poisson_pdf |
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497 binomial_inv hypergeometric_rnd poisson_rnd |
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498 binomial_pdf intersection polyinteg |
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499 binomial_rnd is_bool setstr |
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500 chisquare_cdf is_complex struct_contains |
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501 chisquare_inv is_list struct_elements |
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502 chisquare_pdf is_matrix t_cdf |
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503 chisquare_rnd is_scalar t_inv |
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504 clearplot is_square t_pdf |
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505 clg is_stream t_rnd |
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506 com2str is_struct uniform_cdf |
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507 exponential_cdf is_symmetric uniform_inv |
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508 exponential_inv is_vector uniform_pdf |
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509 exponential_pdf isstr uniform_rnd |
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510 exponential_rnd lognormal_cdf weibcdf |
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511 f_cdf lognormal_inv weibinv |
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512 f_inv lognormal_pdf weibpdf |
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513 f_pdf lognormal_rnd weibrnd |
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514 f_rnd meshdom weibull_cdf |
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515 gamma_cdf normal_cdf weibull_inv |
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516 gamma_inv normal_inv weibull_pdf |
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517 gamma_pdf normal_pdf weibull_rnd |
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518 gamma_rnd normal_rnd wiener_rnd |
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519 geometric_cdf pascal_cdf |
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520 geometric_inv pascal_inv |
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521 |
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522 The following functions are now deprecated in Octave 3.2 and will |
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523 be removed in Octave 3.6 (or whatever version is the second major |
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524 release after 3.2): |
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525 |
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526 create_set spcholinv spmax |
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527 dmult spcumprod spmin |
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528 iscommand spcumsum spprod |
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529 israwcommand spdet spqr |
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530 lchol spdiag spsum |
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531 loadimage spfind spsumsq |
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532 mark_as_command spinv str2mat |
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533 mark_as_rawcommand spkron unmark_command |
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534 spatan2 splchol unmark_rawcommand |
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535 spchol split |
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536 spchol2inv splu |
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537 |
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538 See NEWS.3 for old news. |