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annotate NEWS @ 10938:300636502235
update NEWS
author | Jaroslav Hajek <highegg@gmail.com> |
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date | Wed, 01 Sep 2010 13:39:54 +0200 |
parents | 69a2e9ccb2fb |
children | 07b4cd795742 |
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9352 | 1 Summary of important user-visible changes for version 3.3: |
2 --------------------------------------------------------- | |
3 | |
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4 ** The fltk graphics backend now implements the following callback |
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5 properties: keypressfcn, keyreleasefcn, windowbuttondownfcn, |
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6 windowbuttonmotionfcn, windowbuttonupfcn, and currentpoint. These |
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7 enable keyboard and mouse interaction, an example of which can be |
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8 seen in the __fltk_ginput__.m script. |
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9 |
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10 ** BLAS and LAPACK libraries are now required to build Octave. The |
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11 subset of the reference BLAS and LAPACK libraries has been removed |
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12 from the Octave sources. |
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13 |
10118 | 14 ** The `lookup' function was extended to be more useful for |
15 general-purpose binary searching. Using this improvement, the | |
16 ismember function was rewritten for significantly better | |
17 performance. | |
9352 | 18 |
19 ** Real, integer and logical matrices, when used in indexing, will now | |
20 cache the internal index_vector value (zero-based indices) when | |
21 successfully used as indices, eliminating the conversion penalty for | |
10118 | 22 subsequent indexing by the same matrix. In particular, this means it |
23 is no longer needed to avoid repeated indexing by logical arrays | |
24 using find for performance reasons. | |
9888 | 25 |
10118 | 26 ** Logical matrices are now treated more efficiently when used as |
27 indices. Octave will keep the index as a logical mask unless the | |
28 ratio of true elements is small enough, using a specialized | |
29 code. Previously, all logical matrices were always first converted | |
30 to index vectors. This results in savings in both memory and | |
31 computing time. | |
9480 | 32 |
10118 | 33 ** The `sub2ind' and `ind2sub' functions were reimplemented as compiled |
34 functions for better performance. These functions are now faster, | |
35 can deliver more economized results for ranges, and can reuse the | |
36 index cache mechanism described in previous paragraph. | |
37 | |
38 ** The built-in function equivalents to associative operators (`plus', | |
39 `times', `mtimes', `and', and `or') have been extended to accept | |
40 multiple arguments. This is especially useful for summing | |
41 (multiplying, etc.) lists of objects (of possibly distinct types): | |
9408 | 42 |
9449 | 43 matrix_sum = plus (matrix_list{:}); |
44 | |
10118 | 45 ** An FTP object type based on libcurl has been implemented. These |
46 objects allow ftp connections, downloads and uploads to be | |
47 managed. For example, | |
9880 | 48 |
10118 | 49 fp = ftp ("ftp.octave.org); |
50 cd (fp, "gnu/octave"); | |
51 mget (fp, "octave-3.2.3.tar.bz2"); | |
52 close (fp); | |
9880 | 53 |
10118 | 54 ** The default behavior of `assert (observed, expected)' has been |
55 relaxed to employ less strict checking that does not require the | |
56 internals of the values to match. This avoids previously valid | |
57 tests from breaking due to new internal classes introduced in future | |
58 Octave versions. | |
9449 | 59 |
60 For instance, all of these assertions were true in Octave 3.0.x | |
61 but false in 3.2.x due to new optimizations and improvements: | |
62 | |
63 assert (2*linspace (1, 5, 5), 2*(1:5)) | |
64 assert (zeros (0, 0), []) | |
65 assert (2*ones (1, 5), (2) (ones (1,5))) | |
9462 | 66 |
10118 | 67 ** The behavior of library functions `ismatrix', `issquare', and |
68 `issymmetric' has been changed for better consistency. | |
9873 | 69 |
10292 | 70 * The `ismatrix' function now returns true for all numeric, |
71 logical and character 2d or Nd matrices. Previously, `ismatrix' | |
72 returned false if the first or second dimension was zero. | |
73 Hence, `ismatrix ([])' was false, | |
74 while `ismatrix (zeros (1,2,0))' was true. | |
9873 | 75 |
10118 | 76 * The `issquare' function now returns a logical scalar, and is |
77 equivalent to the expression | |
78 | |
79 ismatrix (x) && ndims (x) == 2 && rows (x) == columns (x) | |
80 | |
81 The dimension is no longer returned. As a result, `issquare ([])' | |
82 now yields true. | |
9873 | 83 |
10118 | 84 * The `issymmetric' function now checks for symmetry instead of |
85 hermitianness. For the latter, ishermitian was created. Also, | |
86 logical scalar is returned rather than the dimension, so | |
87 `issymmetric ([])' is now true. | |
9873 | 88 |
10118 | 89 ** Function handles are now aware of overloaded functions. If a |
90 function is overloaded, the handle determines at the time of its | |
91 reference which function to call. A non-overloaded version does not | |
92 need to exist. | |
9873 | 93 |
10118 | 94 ** Overloading functions for built-in classes (double, int8, cell, |
95 etc.) is now compatible with Matlab. | |
9408 | 96 |
10323 | 97 ** Function handles can now be compared with the == and != operators, |
98 as well as the `isequal' function. | |
99 | |
10118 | 100 ** Performance of concatenation (using []) and the functions `cat', |
101 `horzcat', and `vertcat' has been improved for multidimensional | |
102 arrays. | |
10117 | 103 |
9547 | 104 ** The operation-assignment operators +=, -=, *= and /= now behave more |
10118 | 105 efficiently in certain cases. For instance, if M is a matrix and S a |
106 scalar, then the statement | |
9547 | 107 |
10118 | 108 M += S; |
9547 | 109 |
10118 | 110 will operate on M's data in-place if it is not shared by another |
111 variable, usually increasing both time and memory efficiency. | |
9547 | 112 |
9558 | 113 Only selected common combinations are affected, namely: |
9547 | 114 |
115 matrix += matrix | |
116 matrix -= matrix | |
9558 | 117 matrix .*= matrix |
118 matrix ./= matrix | |
119 | |
9547 | 120 matrix += scalar |
121 matrix -= scalar | |
122 matrix *= scalar | |
123 matrix /= scalar | |
9558 | 124 |
9552 | 125 logical matrix |= logical matrix |
126 logical matrix &= logical matrix | |
9547 | 127 |
10118 | 128 where matrix and scalar belong to the same class. The left-hand |
129 side must be a simple variable reference. | |
9888 | 130 |
10118 | 131 Moreover, when unary operators occur in expressions, Octave will |
132 also try to do the operation in-place if it's argument is a | |
133 temporary expresssion. | |
9589 | 134 |
10118 | 135 ** The effect of comparison operators (<, >, <=, and >=) applied to |
136 complex numbers has changed to be consistent with the strict | |
137 ordering defined by the `max', `min', and `sort' functions. More | |
138 specifically, complex numbers are compared by lexicographical | |
139 comparison of the pairs `[abs(z), arg(z)]'. Previously, only real | |
140 parts were compared; this can be trivially achieved by wrapping the | |
141 operands in real(). | |
9547 | 142 |
10118 | 143 ** The automatic simplification of complex computation results has |
144 changed. Octave will now simplify any complex number with a zero | |
145 imaginary part or any complex matrix with all elements having zero | |
146 imaginary part to a real value. Previously, this was done only for | |
147 positive zeros. Note that the behavior of the complex function is | |
148 unchanged and it still produces a complex value even if the | |
149 imaginary part is zero. | |
9826 | 150 |
10118 | 151 ** As a side effect of code refactoring in liboctave, the binary |
152 logical operations are now more easily amenable to compiler | |
153 optimizations and are thus significantly faster. | |
9595 | 154 |
10118 | 155 ** Octave now allows user-defined `subsasgn' methods to optimize out |
156 redundant copies. For more information, see the manual. | |
9595 | 157 |
10453 | 158 ** More efficient matrix division handling. Octave is now able to |
10118 | 159 handle the expressions |
9664 | 160 |
10118 | 161 M' \ V |
162 M.' \ V | |
163 V / M | |
9664 | 164 |
10118 | 165 (M is a matrix and V is a vector) more efficiently in certain cases. |
166 In particular, if M is triangular, all three expressions will be | |
167 handled by a single call to xTRTRS (from LAPACK), with appropriate | |
10453 | 168 flags. Previously, all three expressions required a physical |
10118 | 169 transpose of M. |
9664 | 170 |
10118 | 171 ** More efficient handling of certain mixed real-complex matrix |
172 operations. For instance, if RM is a real matrix and CM a complex | |
173 matrix, | |
9664 | 174 |
10118 | 175 RM * CM |
9664 | 176 |
177 can now be evaluated either as | |
178 | |
179 complex (RM * real (CM), RM * imag (CM)) | |
180 | |
181 or as | |
182 | |
183 complex (RM) * CM, | |
184 | |
10453 | 185 depending on the dimensions. The first form requires more |
186 temporaries and copying, but halves the FLOP count, which normally | |
187 brings better performance if RM has enough rows. Previously, the | |
188 second form was always used. | |
9664 | 189 |
190 Matrix division is similarly affected. | |
191 | |
10118 | 192 ** More efficient handling of triangular matrix factors returned from |
193 factorizations. The functions for computing QR, LU and Cholesky | |
194 factorizations will now automatically return the triangular matrix | |
195 factors with proper internal matrix_type set, so that it won't need | |
196 to be computed when the matrix is used for division. | |
9717 | 197 |
10118 | 198 ** The built-in `sum' function now handles the non-native summation |
199 (i.e., double precision sum of single or integer inputs) more | |
200 efficiently, avoiding a temporary conversion of the whole input | |
201 array to doubles. Further, `sum' can now accept an extra option | |
202 argument, using a compensated summation algorithm rather than a | |
203 straightforward sum, which significantly improves precision if lots | |
204 of cancellation occurs in the summation. | |
9717 | 205 |
10118 | 206 ** The built-in `bsxfun' function now uses optimized code for certain |
207 cases where built-in operator handles are passed in. Namely, the | |
208 optimizations concern the operators `plus', `minus', `times', | |
209 `ldivide', `rdivide', `power', `and', `or' (for logical arrays), | |
210 the relational operators `eq', `ne', `lt', `le', `gt', `ge', and the | |
211 functions `min' and `max'. Optimizations only apply when both | |
212 operands are of the same built-in class. Mixed real/complex and | |
213 single/double operations will first convert both operands to a | |
214 common type. | |
9745 | 215 |
10118 | 216 ** The `strfind' and `strrep' functions now have compiled |
217 implementations, facilitating significantly more efficient searching | |
218 and replacing in strings, especially with longer patterns. The code | |
219 of `strcat' has been vectorized and is now much more efficient when | |
220 many strings are concatenated. The `strcmpi' and `strncmpi' | |
221 functions are now built-in functions, providing better performance. | |
10208 | 222 |
10453 | 223 ** Matlab-style ignoring input and output function arguments using |
10886 | 224 tilde (~) is now supported. Ignored output arguments may be detected |
225 from a function using the built-in function `isargout'. | |
226 For more details, consult the manual. | |
227 | |
10233 | 228 |
10453 | 229 ** The list datatype, deprecated since the introduction of cells, has |
230 been removed. | |
10276 | 231 |
10453 | 232 ** The accumarray function has been optimized and is now significantly |
233 faster in certain important cases. | |
10054 | 234 |
10292 | 235 ** The behavior of isreal and isnumeric functions was changed to be more |
236 Matlab-compatible. | |
237 | |
10406 | 238 ** The integer math & conversion warnings (Octave:int-convert-nan, |
239 Octave:int-convert-non-int-val, Octave:int-convert-overflow, | |
240 Octave:int-math-overflow) have been removed. | |
241 | |
10453 | 242 ** rem and mod are now built-in functions. They also handle integer |
243 types efficiently using integer arithmetic. | |
10437 | 244 |
10536 | 245 ** Sparse indexing and indexed assignment has been mostly rewritten. |
246 Since Octave uses compressed column storage for sparse matrices, | |
247 major attention is devoted to operations manipulating whole columns. | |
248 Such operations are now significantly faster, as well as some other | |
249 important cases. | |
250 | |
251 Further, it is now possible to pre-allocate a sparse matrix and | |
252 subsequently fill it by assignments, provided they meet certain | |
253 conditions. For more information, consult the `spalloc' function, | |
254 which is no longer a mere dummy. Consequently, nzmax and nnz are no | |
255 longer always equal in Octave. Octave may also produce a matrix with | |
256 nnz < nzmax as a result of other operations, so you should | |
257 consistently use nnz unless you really want to use nzmax | |
258 (i.e. the space allocated for nonzero elements). | |
259 | |
260 Sparse concatenation is also affected, and concatenating sparse | |
261 matrices, especially larger collections, is now significantly more | |
262 efficient. This applies to both the [] operator and the | |
263 cat/vertcat/horzcat functions. | |
264 | |
10639 | 265 ** It is now possible to optionally employ the xGESDD LAPACK drivers for |
266 computing the singular value decomposition using svd(), instead of | |
267 the default xGESVD, using the configuration pseudo-variable | |
268 svd_driver. The xGESDD driver can be up to 6x times faster when | |
269 singular vectors are requested, but is reported to be somewhat less | |
270 robust on highly ill-conditioned matrices. | |
271 | |
272 ** Configuration pseudo-variables, such as page_screen_output or | |
273 confirm_recursive_rmdir (or the above mentioned svd_driver), now | |
274 accept a "local" option as second argument, requesting the change | |
275 to be undone when current function returns: | |
276 | |
277 function [status, msg] = rm_rf (dir) | |
278 confirm_recursive_rmdir (false, "local"); | |
279 [status, msg] = rmdir (dir, "s"); | |
280 ... | |
281 endfunction | |
282 | |
283 Upon return, confirm_recursive_rmdir will be restored to the value | |
284 it had on entry to the function, even if there were subsequent | |
285 changes to the variable in function rm_rf or any of the functions | |
286 it calls. | |
287 | |
10774 | 288 ** pkg now accepts a -forge option for downloading and installing packages |
289 from OctaveForge automatically. For example, | |
290 | |
291 pkg install -forge general | |
292 | |
293 will automatically download the latest release of the general package and | |
294 attempt to install it. No automatic resolving of dependencies is provided. | |
295 Further, | |
10639 | 296 |
10774 | 297 pkg list -forge |
298 | |
299 can be used to list all available packages. | |
300 | |
301 ** The internal data representation of structs has been completely rewritten | |
302 to make certain optimizations feasible. The field data can now be shared | |
303 between structs with equal keys but different dimensions or values, making | |
304 operations that preserve the fields faster. Economized storage is now used | |
305 for scalar structs (just like most other scalars), making their usage more | |
306 memory-efficient. Certain array-like operations on structs (concatenation, | |
307 uniform cellfun, num2cell) have gained a significant speed-up. | |
308 Additionally, the octave_scalar_map class now provides a simpler interface | |
309 to work with scalar structs within a C++ DLD function. | |
10639 | 310 |
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311 ** Two new formats are available for displaying numbers: |
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312 format short eng |
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313 format long eng |
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314 Both display numbers in engineering notation, i.e., mantissa + exponent |
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315 where the exponent is a multiple of 3. |
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316 |
10829 | 317 ** The following new functions were added: |
318 | |
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319 accumdim erfcx luupdate ppder rsf2csf |
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320 bitpack fileread merge ppint sizemax |
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321 bitunpack fminbnd nfields ppjumps strread |
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322 blkmm fskipl nth_element pqpnonneg textread |
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323 cbrt ifelse onCleanup randi whitebg |
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324 chop ishermitian pbaspect repelems |
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325 daspect isindex powerset reset |
10873 | 326 |
327 ** The behavior of struct assignments to non-struct values has been changed. | |
328 Previously, it was possible to overwrite an arbitrary value: | |
329 | |
330 a = 1; | |
331 a.x = 2; | |
332 | |
333 This is no longer possible unless a is an empty matrix or cell array. | |
10938 | 334 |
335 ** By popular demand, dlmread has been extended to allow specifying a custom | |
336 value for empty fields and also to accept file IDs opened by fopen. Likewise, | |
337 dlmwrite can write to file IDs. | |
10829 | 338 |
339 | |
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340 Summary of important user-visible changes for version 3.2: |
5913 | 341 --------------------------------------------------------- |
2452 | 342 |
8737 | 343 ** Compatibility with Matlab graphics has been improved. |
6329 | 344 |
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345 The hggroup object and associated listener callback functions have |
8737 | 346 been added allowing the inclusion of group objects. Data sources |
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347 have been added to these group objects such that |
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348 |
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349 x = 0:0.1:10; |
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350 y = sin (x); |
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351 plot (x, y, "ydatasource", "y"); |
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352 for i = 1 : 100 |
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353 pause(0.1) |
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354 y = sin (x + 0.1 * i); |
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355 refreshdata(); |
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356 endfor |
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357 |
8737 | 358 works as expected. This capability has be used to introduce |
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359 stem-series, bar-series, etc., objects for better Matlab |
8737 | 360 compatibility. |
361 | |
362 ** New graphics functions: | |
363 | |
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364 addlistener ezcontour gcbo refresh |
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365 addproperty ezcontourf ginput refreshdata |
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366 allchild ezmesh gtext specular |
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367 available_backends ezmeshc intwarning surfl |
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368 backend ezplot ishghandle trisurf |
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369 cla ezplot3 isocolors waitforbuttonpress |
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370 clabel ezpolar isonormals |
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371 comet ezsurf isosurface |
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372 dellistener findall linkprop |
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373 diffuse gcbf plotmatrix |
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374 |
8737 | 375 ** New experimental OpenGL/FLTK based plotting system. |
376 | |
377 An experimental plotting system based on OpenGL and the FLTK | |
378 toolkit is now part of Octave. This backend is disabled by | |
379 default. You can switch to using it with the command | |
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380 |
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381 backend ("fltk") |
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382 |
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383 for all future figures or for a particular figure with the command |
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384 |
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385 backend (h, "fltk") |
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386 |
8737 | 387 where "h" is a valid figure handle. Please note that this backend |
388 does not yet support text objects. Obviously, this is a necessary | |
389 feature before it can be considered usable. We are looking for | |
390 volunteers to help implement this missing feature. | |
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391 |
8737 | 392 ** Functions providing direct access to gnuplot have been removed. |
393 | |
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394 The functions __gnuplot_plot__, __gnuplot_set__, __gnuplot_raw__, |
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395 __gnuplot_show__, __gnuplot_replot__, __gnuplot_splot__, |
8737 | 396 __gnuplot_save_data__ and __gnuplot_send_inline_data__ have been |
397 removed from Octave. These function were incompatible with the | |
398 high level graphics handle code. | |
6329 | 399 |
8885 | 400 ** The Control, Finance and Quaternion functions have been removed. |
401 | |
402 These functions are now available as separate packages from | |
403 | |
404 http://octave.sourceforge.net/packages.html | |
405 | |
406 and can be reinstalled using the Octave package manager (see | |
407 the pkg function). | |
408 | |
409 ** Specific sparse matrix functions removed. | |
410 | |
411 The following functions, which handled only sparse matrices have | |
412 been removed. Instead of calling these functions directly, you | |
413 should use the corresponding function without the "sp" prefix. | |
8737 | 414 |
8885 | 415 spatan2 spcumsum spkron spprod |
416 spchol spdet splchol spqr | |
417 spchol2inv spdiag splu spsum | |
418 spcholinv spfind spmax spsumsqk | |
419 spcumprod spinv spmin | |
420 | |
421 ** Improvements to the debugger. | |
422 | |
423 The interactive debugging features have been improved. Stopping | |
424 on statements with dbstop should work correctly now. Stepping | |
425 into and over functions, and stepping one statement at a time | |
426 (with dbstep) now works. Moving up and down the call stack with | |
427 dbup and dbdown now works. The dbstack function is now available | |
428 to print the current function call stack. The new dbquit function | |
429 is available to exit the debugging mode. | |
430 | |
431 ** Improved traceback error messages. | |
432 | |
433 Traceback error messages are much more concise and easier to | |
434 understand. They now display information about the function call | |
435 stack instead of the stack of all statements that were active at | |
436 the point of the error. | |
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437 |
8737 | 438 ** Object Oriented Programming. |
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439 |
8737 | 440 Octave now includes OOP features and the user can create their own |
441 class objects and overloaded functions and operators. For | |
442 example, all methods of a class called "myclass" will be found in | |
443 a directory "@myclass" on the users path. The class specific | |
444 versions of functions and operators take precedence over the | |
445 generic versions of these functions. | |
446 | |
447 New functions related to OOP include | |
7189 | 448 |
8737 | 449 class inferiorto isobject loadobj methods superiorto |
450 | |
451 See the Octave manual for more details. | |
7038 | 452 |
8747 | 453 ** Parsing of Command-style Functions. |
454 | |
455 Octave now parses command-style functions without needing to first | |
456 declare them with "mark_as_command". The rules for recognizing a | |
457 command-style function calls are | |
458 | |
459 * A command must appear as the first word in a statement, | |
460 followed by a space. | |
461 | |
462 * The first character after the space must not be '=' or '(' | |
463 | |
464 * The next token after the space must not look like a binary | |
465 operator. | |
466 | |
467 These rules should be mostly compatible with the way Matlab parses | |
468 command-style function calls and allow users to define commands in | |
469 .m files without having to mark them as commands. | |
470 | |
471 Note that previous versions of Octave allowed expressions like | |
472 | |
473 x = load -text foo.dat | |
474 | |
475 but an expression like this will now generate a parse error. In | |
476 order to assign the value returned by a function to a variable, | |
477 you must use the normal function call syntax: | |
478 | |
479 x = load ("-text", "foo.dat"); | |
480 | |
8737 | 481 ** Block comments. |
482 | |
8747 | 483 Commented code can be between matching "#{" and "#}" or "%{" and |
484 "%}" markers, even if the commented code spans several line. This | |
485 allows blocks code to be commented, without needing to comment | |
486 each line. For example, | |
5814 | 487 |
8747 | 488 function [s, t] = func (x, y) |
489 s = 2 * x; | |
490 #{ | |
491 s *= y; | |
492 t = y + x; | |
493 #} | |
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494 endfunction |
5814 | 495 |
8747 | 496 the lines "s *= y;" and "t = y + x" will not be executed. |
8737 | 497 |
498 ** Special treatment in the parser of expressions like "a' * b". | |
2452 | 499 |
8737 | 500 In these cases the transpose is no longer explicitly formed and |
501 BLAS libraries are called with the transpose flagged, | |
502 significantly improving performance for these kinds of | |
503 operations. | |
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504 |
8737 | 505 ** Single Precision data type. |
2452 | 506 |
8737 | 507 Octave now includes a single precision data type. Single |
508 precision variables can be created with the "single" command, or | |
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509 from functions like ones, eye, etc. For example, |
5995 | 510 |
8737 | 511 single (1) |
512 ones (2, 2, "single") | |
513 zeros (2, 2, "single") | |
514 eye (2, 2, "single") | |
515 Inf (2, 2, "single") | |
516 NaN (2, 2, "single") | |
517 NA (2, 2, "single") | |
7279 | 518 |
8737 | 519 all create single precision variables. For compatibility with |
520 Matlab, mixed double/single precision operators and functions | |
521 return single precision types. | |
522 | |
523 As a consequence of this addition to Octave the internal | |
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524 representation of the double precision NA value has changed, and |
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525 so users that make use of data generated by Octave with R or |
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526 visa-versa are warned that compatibility might not be assured. |
7279 | 527 |
8737 | 528 ** Improved array indexing. |
529 | |
530 The underlying code used for indexing of arrays has been | |
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531 completely rewritten and indexing is now significantly faster. |
8737 | 532 |
8755 | 533 ** Improved memory management. |
534 | |
535 Octave will now attempt to share data in some cases where previously | |
536 a copy would be made, such as certain array slicing operations or | |
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537 conversions between cells, structs and cs-lists. This usually reduces |
8755 | 538 both time and memory consumption. |
9128 | 539 Also, Octave will now attempt to detect and optimize usage of a vector |
540 as a stack, when elements are being repeatedly inserted at/removed from | |
541 the end of the vector. | |
8755 | 542 |
8738 | 543 ** Improved performance for reduction operations. |
544 | |
8755 | 545 The performance of the sum, prod, sumsq, cumsum, cumprod, any, all, |
546 max and min functions has been significantly improved. | |
8738 | 547 |
9006 | 548 ** Sorting and searching. |
549 | |
550 The performance of sort has been improved, especially when sorting | |
10453 | 551 indices are requested. An efficient built-in issorted |
552 implementation was added. The sortrows function now uses a more | |
553 efficient algorithm, especially in the homegeneous case. The lookup | |
554 function is now a built-in function performing a binary search, | |
555 optimized for long runs of close elements. Lookup also works with | |
556 cell arrays of strings. | |
9006 | 557 |
558 ** Range arithmetics | |
559 | |
10453 | 560 For some operations on ranges, Octave will attempt to keep the |
561 result as a range. These include negation, adding a scalar, | |
562 subtracting a scalar, and multiplying by a scalar. Ranges with zero | |
563 increment are allowed and can be constructed using the built-in | |
564 function `ones'. | |
9006 | 565 |
566 ** Various performance improvements. | |
567 | |
10453 | 568 Performance of a number of other built-in operations and functions |
569 was improved, including: | |
9006 | 570 |
571 * logical operations | |
572 * comparison operators | |
573 * element-wise power | |
574 * accumarray | |
575 * cellfun | |
576 * isnan | |
577 * isinf | |
578 * isfinite | |
579 * nchoosek | |
580 * repmat | |
581 * strcmp | |
582 | |
8737 | 583 ** 64-bit integer arithmetic. |
584 | |
585 Arithmetic with 64-bit integers (int64 and uint64 types) is fully | |
586 supported, with saturation semantics like the other integer types. | |
587 Performance of most integer arithmetic operations has been | |
588 improved by using integer arithmetic directly. Previously, Octave | |
589 performed integer math with saturation semantics by converting the | |
590 operands to double precision, performing the operation, and then | |
591 converting the result back to an integer value, truncating if | |
592 necessary. | |
593 | |
8885 | 594 ** Diagonal and permutation matrices. |
595 | |
596 The interpreter can now treat diagonal and permutation matrices as | |
597 special objects that store only the non-zero elements, rather than | |
598 general full matrices. Therefore, it is now possible to construct | |
599 and use these matrices in linear algebra without suffering a | |
600 performance penalty due to storing large numbers of zero elements. | |
601 | |
602 ** Improvements to fsolve. | |
603 | |
604 The fsolve function now accepts an option structure argument (see | |
605 also the optimset function). The INFO values returned from fsolve | |
606 have changed to be compatible with Matlab's fsolve function. | |
607 Additionally, fsolve is now able to solve overdetermined systems, | |
608 complex-differentiable complex systems, systems with a sparse | |
609 jacobian and can work in single precision if given single precision | |
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610 inputs. It can also be called recursively. |
8885 | 611 |
8737 | 612 ** Improvements to the norm function. |
613 | |
614 The norm function is now able to compute row or column norms of a | |
615 matrix in a single call, as well as general matrix p-norms. | |
616 | |
617 ** New functions for computing some eigenvalues or singular values. | |
618 | |
619 The eigs and svds functions have been included in Octave. These | |
620 functions require the ARPACK library (now distributed under a | |
621 GPL-compatible license). | |
622 | |
623 ** New QR and Cholesky factorization updating functions. | |
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624 |
8737 | 625 choldelete cholshift qrdelete qrshift |
626 cholinsert cholupdate qrinsert qrupdate | |
627 | |
628 ** New quadrature functions. | |
629 | |
630 dblquad quadgk quadv triplequad | |
631 | |
8885 | 632 ** New functions for reading and writing images. |
633 | |
634 The imwrite and imread functions have been included in Octave. | |
635 These functions require the GraphicsMagick library. The new | |
636 function imfinfo provides information about an image file (size, | |
637 type, colors, etc.) | |
638 | |
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639 ** The input_event_hook function has been replaced by the pair of |
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640 functions add_input_event_hook and remove_input_event_hook so that |
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641 more than one hook function may be installed at a time. |
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642 |
8737 | 643 ** Other miscellaneous new functions. |
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644 |
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645 addtodate hypot reallog |
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646 bicgstab idivide realpow |
9006 | 647 cellslices info realsqrt |
648 cgs interp1q rectint | |
649 command_line_path isdebugmode regexptranslate | |
650 contrast isfloat restoredefaultpath | |
651 convn isstrprop roundb | |
652 cummin log1p rundemos | |
653 cummax lsqnonneg runlength | |
654 datetick matlabroot saveobj | |
655 display namelengthmax spaugment | |
656 expm1 nargoutchk strchr | |
657 filemarker pathdef strvcat | |
658 fstat perl subspace | |
659 full prctile symvar | |
660 fzero quantile treelayout | |
661 genvarname re_read_readline_init_file validatestring | |
662 histc | |
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663 |
8885 | 664 ** Changes to strcat. |
665 | |
666 The strcat function is now compatible with Matlab's strcat | |
667 function, which removes trailing whitespace when concatenating | |
668 character strings. For example | |
669 | |
670 strcat ('foo ', 'bar') | |
671 ==> 'foobar' | |
672 | |
673 The new function cstrcat provides the previous behavior of | |
674 Octave's strcat. | |
675 | |
676 ** Improvements to the help functions. | |
677 | |
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678 The help system has been mostly re-implemented in .m files to make |
8885 | 679 it easier to modify. Performance of the lookfor function has been |
680 greatly improved by caching the help text from all functions that | |
681 are distributed with Octave. The pkg function has been modified | |
682 to generate cache files for external packages when they are | |
683 installed. | |
684 | |
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685 ** Deprecated functions. |
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686 |
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687 The following functions were deprecated in Octave 3.0 and will be |
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688 removed in Octave 3.4 (or whatever version is the second major |
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689 release after 3.0): |
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690 |
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691 beta_cdf geometric_pdf pascal_pdf |
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692 beta_inv geometric_rnd pascal_rnd |
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693 beta_pdf hypergeometric_cdf poisson_cdf |
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694 beta_rnd hypergeometric_inv poisson_inv |
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695 binomial_cdf hypergeometric_pdf poisson_pdf |
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696 binomial_inv hypergeometric_rnd poisson_rnd |
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697 binomial_pdf intersection polyinteg |
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698 binomial_rnd is_bool setstr |
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699 chisquare_cdf is_complex struct_contains |
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700 chisquare_inv is_list struct_elements |
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701 chisquare_pdf is_matrix t_cdf |
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702 chisquare_rnd is_scalar t_inv |
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703 clearplot is_square t_pdf |
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704 clg is_stream t_rnd |
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705 com2str is_struct uniform_cdf |
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706 exponential_cdf is_symmetric uniform_inv |
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707 exponential_inv is_vector uniform_pdf |
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708 exponential_pdf isstr uniform_rnd |
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709 exponential_rnd lognormal_cdf weibcdf |
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710 f_cdf lognormal_inv weibinv |
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711 f_inv lognormal_pdf weibpdf |
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712 f_pdf lognormal_rnd weibrnd |
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713 f_rnd meshdom weibull_cdf |
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714 gamma_cdf normal_cdf weibull_inv |
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715 gamma_inv normal_inv weibull_pdf |
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716 gamma_pdf normal_pdf weibull_rnd |
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717 gamma_rnd normal_rnd wiener_rnd |
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718 geometric_cdf pascal_cdf |
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719 geometric_inv pascal_inv |
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720 |
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721 The following functions are now deprecated in Octave 3.2 and will |
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John W. Eaton <jwe@octave.org>
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722 be removed in Octave 3.6 (or whatever version is the second major |
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723 release after 3.2): |
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724 |
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725 create_set spcholinv spmax |
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726 dmult spcumprod spmin |
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727 iscommand spcumsum spprod |
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728 israwcommand spdet spqr |
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729 lchol spdiag spsum |
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730 loadimage spfind spsumsq |
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731 mark_as_command spinv str2mat |
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732 mark_as_rawcommand spkron unmark_command |
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733 spatan2 splchol unmark_rawcommand |
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734 spchol split |
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735 spchol2inv splu |
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736 |
7990
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737 See NEWS.3 for old news. |