Mercurial > octave
annotate NEWS @ 12418:b914e8125f1b
NEWS: Use indent of 2 spaces rather than occasional 3 spaces.
author | Rik <octave@nomad.inbox5.com> |
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date | Tue, 08 Feb 2011 16:10:31 -0800 |
parents | b7d0d6044bd7 |
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1 Summary of important user-visible changes for version 3.6: |
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2 --------------------------------------------------------- |
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3 |
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4 ** Deprecated functions. |
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5 |
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6 The following functions were deprecated in Octave 3.2 and have been |
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7 removed from Octave 3.6. |
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8 |
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9 create_set spcholinv splu |
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10 dmult spcumprod spmax |
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11 iscommand spcumsum spmin |
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12 israwcommand spdet spprod |
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13 lchol spdiag spqr |
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14 loadimage spfind spsum |
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15 mark_as_command sphcat spsumsq |
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16 mark_as_rawcommand spinv spvcat |
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17 spatan2 spkron str2mat |
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18 spchol splchol unmark_command |
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19 spchol2inv split unmark_rawcommand |
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20 |
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21 Summary of important user-visible changes for version 3.4: |
9352 | 22 --------------------------------------------------------- |
23 | |
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24 ** BLAS and LAPACK libraries are now required to build Octave. The |
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25 subset of the reference BLAS and LAPACK libraries has been removed |
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26 from the Octave sources. |
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27 |
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28 ** The ARPACK library is now distributed with Octave so it no longer |
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29 needs to be available as an external dependency when building |
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30 Octave. |
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31 |
10118 | 32 ** The `lookup' function was extended to be more useful for |
33 general-purpose binary searching. Using this improvement, the | |
34 ismember function was rewritten for significantly better | |
35 performance. | |
9352 | 36 |
37 ** Real, integer and logical matrices, when used in indexing, will now | |
38 cache the internal index_vector value (zero-based indices) when | |
39 successfully used as indices, eliminating the conversion penalty for | |
10118 | 40 subsequent indexing by the same matrix. In particular, this means it |
41 is no longer needed to avoid repeated indexing by logical arrays | |
42 using find for performance reasons. | |
9888 | 43 |
10118 | 44 ** Logical matrices are now treated more efficiently when used as |
45 indices. Octave will keep the index as a logical mask unless the | |
46 ratio of true elements is small enough, using a specialized | |
47 code. Previously, all logical matrices were always first converted | |
48 to index vectors. This results in savings in both memory and | |
49 computing time. | |
9480 | 50 |
10118 | 51 ** The `sub2ind' and `ind2sub' functions were reimplemented as compiled |
52 functions for better performance. These functions are now faster, | |
53 can deliver more economized results for ranges, and can reuse the | |
54 index cache mechanism described in previous paragraph. | |
55 | |
56 ** The built-in function equivalents to associative operators (`plus', | |
57 `times', `mtimes', `and', and `or') have been extended to accept | |
58 multiple arguments. This is especially useful for summing | |
59 (multiplying, etc.) lists of objects (of possibly distinct types): | |
9408 | 60 |
9449 | 61 matrix_sum = plus (matrix_list{:}); |
62 | |
10118 | 63 ** An FTP object type based on libcurl has been implemented. These |
64 objects allow ftp connections, downloads and uploads to be | |
65 managed. For example, | |
9880 | 66 |
10118 | 67 fp = ftp ("ftp.octave.org); |
68 cd (fp, "gnu/octave"); | |
69 mget (fp, "octave-3.2.3.tar.bz2"); | |
70 close (fp); | |
9880 | 71 |
10118 | 72 ** The default behavior of `assert (observed, expected)' has been |
73 relaxed to employ less strict checking that does not require the | |
74 internals of the values to match. This avoids previously valid | |
75 tests from breaking due to new internal classes introduced in future | |
76 Octave versions. | |
9449 | 77 |
78 For instance, all of these assertions were true in Octave 3.0.x | |
79 but false in 3.2.x due to new optimizations and improvements: | |
80 | |
81 assert (2*linspace (1, 5, 5), 2*(1:5)) | |
82 assert (zeros (0, 0), []) | |
83 assert (2*ones (1, 5), (2) (ones (1,5))) | |
9462 | 84 |
10118 | 85 ** The behavior of library functions `ismatrix', `issquare', and |
86 `issymmetric' has been changed for better consistency. | |
9873 | 87 |
10292 | 88 * The `ismatrix' function now returns true for all numeric, |
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89 logical and character 2-D or N-D matrices. Previously, `ismatrix' |
10292 | 90 returned false if the first or second dimension was zero. |
91 Hence, `ismatrix ([])' was false, | |
92 while `ismatrix (zeros (1,2,0))' was true. | |
9873 | 93 |
10118 | 94 * The `issquare' function now returns a logical scalar, and is |
95 equivalent to the expression | |
96 | |
97 ismatrix (x) && ndims (x) == 2 && rows (x) == columns (x) | |
98 | |
99 The dimension is no longer returned. As a result, `issquare ([])' | |
100 now yields true. | |
9873 | 101 |
10118 | 102 * The `issymmetric' function now checks for symmetry instead of |
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103 Hermitianness. For the latter, ishermitian was created. Also, |
10118 | 104 logical scalar is returned rather than the dimension, so |
105 `issymmetric ([])' is now true. | |
9873 | 106 |
10118 | 107 ** Function handles are now aware of overloaded functions. If a |
108 function is overloaded, the handle determines at the time of its | |
109 reference which function to call. A non-overloaded version does not | |
110 need to exist. | |
9873 | 111 |
10118 | 112 ** Overloading functions for built-in classes (double, int8, cell, |
113 etc.) is now compatible with Matlab. | |
9408 | 114 |
10323 | 115 ** Function handles can now be compared with the == and != operators, |
116 as well as the `isequal' function. | |
117 | |
10118 | 118 ** Performance of concatenation (using []) and the functions `cat', |
119 `horzcat', and `vertcat' has been improved for multidimensional | |
120 arrays. | |
10117 | 121 |
9547 | 122 ** The operation-assignment operators +=, -=, *= and /= now behave more |
10118 | 123 efficiently in certain cases. For instance, if M is a matrix and S a |
124 scalar, then the statement | |
9547 | 125 |
10118 | 126 M += S; |
9547 | 127 |
10118 | 128 will operate on M's data in-place if it is not shared by another |
129 variable, usually increasing both time and memory efficiency. | |
9547 | 130 |
9558 | 131 Only selected common combinations are affected, namely: |
9547 | 132 |
133 matrix += matrix | |
134 matrix -= matrix | |
9558 | 135 matrix .*= matrix |
136 matrix ./= matrix | |
137 | |
9547 | 138 matrix += scalar |
139 matrix -= scalar | |
140 matrix *= scalar | |
141 matrix /= scalar | |
9558 | 142 |
9552 | 143 logical matrix |= logical matrix |
144 logical matrix &= logical matrix | |
9547 | 145 |
10118 | 146 where matrix and scalar belong to the same class. The left-hand |
147 side must be a simple variable reference. | |
9888 | 148 |
10118 | 149 Moreover, when unary operators occur in expressions, Octave will |
150 also try to do the operation in-place if it's argument is a | |
151 temporary expresssion. | |
9589 | 152 |
10118 | 153 ** The effect of comparison operators (<, >, <=, and >=) applied to |
154 complex numbers has changed to be consistent with the strict | |
155 ordering defined by the `max', `min', and `sort' functions. More | |
156 specifically, complex numbers are compared by lexicographical | |
157 comparison of the pairs `[abs(z), arg(z)]'. Previously, only real | |
158 parts were compared; this can be trivially achieved by wrapping the | |
159 operands in real(). | |
9547 | 160 |
10118 | 161 ** The automatic simplification of complex computation results has |
162 changed. Octave will now simplify any complex number with a zero | |
163 imaginary part or any complex matrix with all elements having zero | |
164 imaginary part to a real value. Previously, this was done only for | |
165 positive zeros. Note that the behavior of the complex function is | |
166 unchanged and it still produces a complex value even if the | |
167 imaginary part is zero. | |
9826 | 168 |
10118 | 169 ** As a side effect of code refactoring in liboctave, the binary |
170 logical operations are now more easily amenable to compiler | |
171 optimizations and are thus significantly faster. | |
9595 | 172 |
10118 | 173 ** Octave now allows user-defined `subsasgn' methods to optimize out |
174 redundant copies. For more information, see the manual. | |
9595 | 175 |
10453 | 176 ** More efficient matrix division handling. Octave is now able to |
10118 | 177 handle the expressions |
9664 | 178 |
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179 M' \ V |
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180 M.' \ V |
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181 V / M |
9664 | 182 |
10118 | 183 (M is a matrix and V is a vector) more efficiently in certain cases. |
184 In particular, if M is triangular, all three expressions will be | |
185 handled by a single call to xTRTRS (from LAPACK), with appropriate | |
10453 | 186 flags. Previously, all three expressions required a physical |
10118 | 187 transpose of M. |
9664 | 188 |
10118 | 189 ** More efficient handling of certain mixed real-complex matrix |
190 operations. For instance, if RM is a real matrix and CM a complex | |
191 matrix, | |
9664 | 192 |
10118 | 193 RM * CM |
9664 | 194 |
195 can now be evaluated either as | |
196 | |
197 complex (RM * real (CM), RM * imag (CM)) | |
198 | |
199 or as | |
200 | |
201 complex (RM) * CM, | |
202 | |
10453 | 203 depending on the dimensions. The first form requires more |
204 temporaries and copying, but halves the FLOP count, which normally | |
205 brings better performance if RM has enough rows. Previously, the | |
206 second form was always used. | |
9664 | 207 |
11111 | 208 Matrix division is similarly affected. |
9664 | 209 |
10118 | 210 ** More efficient handling of triangular matrix factors returned from |
211 factorizations. The functions for computing QR, LU and Cholesky | |
212 factorizations will now automatically return the triangular matrix | |
213 factors with proper internal matrix_type set, so that it won't need | |
214 to be computed when the matrix is used for division. | |
9717 | 215 |
10118 | 216 ** The built-in `sum' function now handles the non-native summation |
217 (i.e., double precision sum of single or integer inputs) more | |
218 efficiently, avoiding a temporary conversion of the whole input | |
219 array to doubles. Further, `sum' can now accept an extra option | |
220 argument, using a compensated summation algorithm rather than a | |
221 straightforward sum, which significantly improves precision if lots | |
222 of cancellation occurs in the summation. | |
9717 | 223 |
10118 | 224 ** The built-in `bsxfun' function now uses optimized code for certain |
225 cases where built-in operator handles are passed in. Namely, the | |
226 optimizations concern the operators `plus', `minus', `times', | |
227 `ldivide', `rdivide', `power', `and', `or' (for logical arrays), | |
228 the relational operators `eq', `ne', `lt', `le', `gt', `ge', and the | |
229 functions `min' and `max'. Optimizations only apply when both | |
230 operands are of the same built-in class. Mixed real/complex and | |
231 single/double operations will first convert both operands to a | |
232 common type. | |
9745 | 233 |
10118 | 234 ** The `strfind' and `strrep' functions now have compiled |
235 implementations, facilitating significantly more efficient searching | |
236 and replacing in strings, especially with longer patterns. The code | |
237 of `strcat' has been vectorized and is now much more efficient when | |
238 many strings are concatenated. The `strcmpi' and `strncmpi' | |
239 functions are now built-in functions, providing better performance. | |
10208 | 240 |
10453 | 241 ** Matlab-style ignoring input and output function arguments using |
11111 | 242 tilde (~) is now supported. Ignored output arguments may be |
243 detected from a function using the built-in function `isargout'. | |
244 For more details, consult the manual. | |
10886 | 245 |
10453 | 246 ** The list datatype, deprecated since the introduction of cells, has |
247 been removed. | |
10276 | 248 |
10453 | 249 ** The accumarray function has been optimized and is now significantly |
250 faster in certain important cases. | |
10054 | 251 |
10292 | 252 ** The behavior of isreal and isnumeric functions was changed to be more |
253 Matlab-compatible. | |
254 | |
10406 | 255 ** The integer math & conversion warnings (Octave:int-convert-nan, |
256 Octave:int-convert-non-int-val, Octave:int-convert-overflow, | |
11111 | 257 Octave:int-math-overflow) have been removed. |
10406 | 258 |
10453 | 259 ** rem and mod are now built-in functions. They also handle integer |
260 types efficiently using integer arithmetic. | |
10437 | 261 |
10536 | 262 ** Sparse indexing and indexed assignment has been mostly rewritten. |
263 Since Octave uses compressed column storage for sparse matrices, | |
264 major attention is devoted to operations manipulating whole columns. | |
265 Such operations are now significantly faster, as well as some other | |
266 important cases. | |
267 | |
268 Further, it is now possible to pre-allocate a sparse matrix and | |
269 subsequently fill it by assignments, provided they meet certain | |
270 conditions. For more information, consult the `spalloc' function, | |
271 which is no longer a mere dummy. Consequently, nzmax and nnz are no | |
11111 | 272 longer always equal in Octave. Octave may also produce a matrix |
273 with nnz < nzmax as a result of other operations, so you should | |
274 consistently use nnz unless you really want to use nzmax (i.e. the | |
275 space allocated for nonzero elements). | |
10536 | 276 |
277 Sparse concatenation is also affected, and concatenating sparse | |
278 matrices, especially larger collections, is now significantly more | |
11111 | 279 efficient. This applies to both the [] operator and the |
10536 | 280 cat/vertcat/horzcat functions. |
281 | |
11111 | 282 ** It is now possible to optionally employ the xGESDD LAPACK drivers |
283 for computing the singular value decomposition using svd(), instead | |
284 of the default xGESVD, using the configuration pseudo-variable | |
285 svd_driver. The xGESDD driver can be up to 6x times faster when | |
286 singular vectors are requested, but is reported to be somewhat less | |
10639 | 287 robust on highly ill-conditioned matrices. |
288 | |
289 ** Configuration pseudo-variables, such as page_screen_output or | |
290 confirm_recursive_rmdir (or the above mentioned svd_driver), now | |
291 accept a "local" option as second argument, requesting the change | |
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292 to be undone when the current function returns: |
10639 | 293 |
294 function [status, msg] = rm_rf (dir) | |
295 confirm_recursive_rmdir (false, "local"); | |
296 [status, msg] = rmdir (dir, "s"); | |
297 ... | |
298 endfunction | |
299 | |
300 Upon return, confirm_recursive_rmdir will be restored to the value | |
301 it had on entry to the function, even if there were subsequent | |
302 changes to the variable in function rm_rf or any of the functions | |
303 it calls. | |
304 | |
11111 | 305 ** pkg now accepts a -forge option for downloading and installing |
306 packages from Octave Forge automatically. For example, | |
10774 | 307 |
308 pkg install -forge general | |
309 | |
11111 | 310 will automatically download the latest release of the general |
311 package and attempt to install it. No automatic resolving of | |
312 dependencies is provided. Further, | |
10639 | 313 |
10774 | 314 pkg list -forge |
315 | |
316 can be used to list all available packages. | |
317 | |
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318 ** The internal data representation of structs has been completely |
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319 rewritten to make certain optimizations feasible. The field data |
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320 can now be shared between structs with equal keys but different |
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321 dimensions or values, making operations that preserve the fields |
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322 faster. Economized storage is now used for scalar structs (just |
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323 like most other scalars), making their usage more |
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324 memory-efficient. Certain array-like operations on structs |
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325 (concatenation, uniform cellfun, num2cell) have gained a |
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326 significant speed-up. Additionally, the octave_scalar_map class |
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327 now provides a simpler interface to work with scalar structs within |
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328 a C++ DLD function. |
10639 | 329 |
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330 ** Two new formats are available for displaying numbers: |
11111 | 331 |
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332 format short eng |
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333 format long eng |
11111 | 334 |
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335 Both display numbers in engineering notation, i.e., mantissa + |
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336 exponent where the exponent is a multiple of 3. |
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337 |
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338 ** The following functions are new in Octave 3.4: |
10829 | 339 |
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340 accumdim erfcx nfields pqpnonneg uigetdir |
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341 bitpack fileread nth_element quadcc uigetfile |
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342 bitunpack fminbnd onCleanup randi uiputfile |
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343 blkmm fskipl pbaspect repelems uimenu |
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344 cbrt ifelse pie3 reset whitebg |
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345 curl ishermitian powerset rsf2csf |
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346 chop isindex ppder saveas |
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347 daspect luupdate ppint strread |
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348 divergence merge ppjumps textread |
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349 |
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350 ** Using the image function to view images with external programs such |
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351 as display, xv, and xloadimage is no longer supported. The |
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352 image_viewer function has also been removed. |
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353 |
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354 ** The behavior of struct assignments to non-struct values has been |
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355 changed. Previously, it was possible to overwrite an arbitrary |
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356 value: |
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357 |
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358 a = 1; |
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359 a.x = 2; |
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361 This is no longer possible unless a is an empty matrix or cell |
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362 array. |
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363 |
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364 ** The dlmread function has been extended to allow specifying a custom |
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365 value for empty fields. |
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367 ** The dlmread and dlmwrite functions have been modified to accept |
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368 file IDs (as returned by fopen) in addition to file names. |
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370 ** Octave can now optimize away the interpreter overhead of an |
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371 anonymous function handle, if the function simply calls another |
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372 function or handle with some of its parameters bound to certain |
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373 values. Example: |
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374 |
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375 f = @(x) sum (x, 1); |
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377 When f is called, the call is forwarded to @sum with the constant 1 |
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378 appended, and the anonymous function call does not occur on the |
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379 call stack. |
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381 ** Deprecated functions. |
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382 |
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383 The following functions were deprecated in Octave 3.0 and have been |
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384 removed from Octave 3.4. |
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385 |
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386 beta_cdf geometric_pdf pascal_pdf |
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387 beta_inv geometric_rnd pascal_rnd |
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388 beta_pdf hypergeometric_cdf poisson_cdf |
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389 beta_rnd hypergeometric_inv poisson_inv |
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390 binomial_cdf hypergeometric_pdf poisson_pdf |
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391 binomial_inv hypergeometric_rnd poisson_rnd |
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392 binomial_pdf intersection polyinteg |
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393 binomial_rnd is_bool setstr |
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394 chisquare_cdf is_complex struct_contains |
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395 chisquare_inv is_list struct_elements |
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396 chisquare_pdf is_matrix t_cdf |
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397 chisquare_rnd is_scalar t_inv |
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398 clearplot is_square t_pdf |
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399 clg is_stream t_rnd |
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400 com2str is_struct uniform_cdf |
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401 exponential_cdf is_symmetric uniform_inv |
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402 exponential_inv is_vector uniform_pdf |
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403 exponential_pdf isstr uniform_rnd |
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404 exponential_rnd lognormal_cdf weibcdf |
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405 f_cdf lognormal_inv weibinv |
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406 f_inv lognormal_pdf weibpdf |
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407 f_pdf lognormal_rnd weibrnd |
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408 f_rnd meshdom weibull_cdf |
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409 gamma_cdf normal_cdf weibull_inv |
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410 gamma_inv normal_inv weibull_pdf |
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411 gamma_pdf normal_pdf weibull_rnd |
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412 gamma_rnd normal_rnd wiener_rnd |
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413 geometric_cdf pascal_cdf |
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414 geometric_inv pascal_inv |
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415 |
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416 The following functions were deprecated in Octave 3.2 and will |
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417 be removed from Octave 3.6 (or whatever version is the second major |
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418 release after 3.2): |
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419 |
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420 create_set spcholinv splu |
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421 dmult spcumprod spmax |
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422 iscommand spcumsum spmin |
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423 israwcommand spdet spprod |
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424 lchol spdiag spqr |
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425 loadimage spfind spsum |
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426 mark_as_command sphcat spsumsq |
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427 mark_as_rawcommand spinv spvcat |
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428 spatan2 spkron str2mat |
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429 spchol splchol unmark_command |
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430 spchol2inv split unmark_rawcommand |
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431 |
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432 The following functions have been deprecated in Octave 3.4 and will |
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433 be removed from Octave 3.8 (or whatever version is the second major |
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434 release after 3.4): |
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435 |
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436 autocor cellidx gammai krylovb values |
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437 autocov dispatch glpkmex replot |
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438 betai fstat is_global saveimage |
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439 |
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440 ** For compatibility with Matlab, mu2lin (x) is now equivalent to |
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441 mu2lin (x, 0). |
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442 |
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443 Summary of important user-visible changes for version 3.2: |
5913 | 444 --------------------------------------------------------- |
2452 | 445 |
8737 | 446 ** Compatibility with Matlab graphics has been improved. |
6329 | 447 |
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448 The hggroup object and associated listener callback functions have |
8737 | 449 been added allowing the inclusion of group objects. Data sources |
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450 have been added to these group objects such that |
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451 |
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452 x = 0:0.1:10; |
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453 y = sin (x); |
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454 plot (x, y, "ydatasource", "y"); |
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455 for i = 1 : 100 |
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456 pause(0.1) |
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457 y = sin (x + 0.1 * i); |
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458 refreshdata(); |
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459 endfor |
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460 |
8737 | 461 works as expected. This capability has be used to introduce |
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462 stem-series, bar-series, etc., objects for better Matlab |
8737 | 463 compatibility. |
464 | |
465 ** New graphics functions: | |
466 | |
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467 addlistener ezcontour gcbo refresh |
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468 addproperty ezcontourf ginput refreshdata |
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469 allchild ezmesh gtext specular |
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470 available_graphics_toolkits ezmeshc intwarning surfl |
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471 graphics_toolkit ezplot ishghandle trisurf |
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472 cla ezplot3 isocolors waitforbuttonpress |
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473 clabel ezpolar isonormals |
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474 comet ezsurf isosurface |
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475 dellistener findall linkprop |
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476 diffuse gcbf plotmatrix |
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477 |
8737 | 478 ** New experimental OpenGL/FLTK based plotting system. |
479 | |
480 An experimental plotting system based on OpenGL and the FLTK | |
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481 toolkit is now part of Octave. This graphics toolkit is disabled by |
8737 | 482 default. You can switch to using it with the command |
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483 |
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484 graphics_toolkit ("fltk") |
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485 |
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486 for all future figures or for a particular figure with the command |
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487 |
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488 graphics_toolkit (h, "fltk") |
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489 |
11139 | 490 where "h" is a valid figure handle. |
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491 |
8737 | 492 ** Functions providing direct access to gnuplot have been removed. |
493 | |
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494 The functions __gnuplot_plot__, __gnuplot_set__, __gnuplot_raw__, |
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495 __gnuplot_show__, __gnuplot_replot__, __gnuplot_splot__, |
8737 | 496 __gnuplot_save_data__ and __gnuplot_send_inline_data__ have been |
497 removed from Octave. These function were incompatible with the | |
498 high level graphics handle code. | |
6329 | 499 |
8885 | 500 ** The Control, Finance and Quaternion functions have been removed. |
501 | |
502 These functions are now available as separate packages from | |
503 | |
504 http://octave.sourceforge.net/packages.html | |
505 | |
506 and can be reinstalled using the Octave package manager (see | |
507 the pkg function). | |
508 | |
509 ** Specific sparse matrix functions removed. | |
510 | |
511 The following functions, which handled only sparse matrices have | |
512 been removed. Instead of calling these functions directly, you | |
513 should use the corresponding function without the "sp" prefix. | |
8737 | 514 |
8885 | 515 spatan2 spcumsum spkron spprod |
516 spchol spdet splchol spqr | |
517 spchol2inv spdiag splu spsum | |
518 spcholinv spfind spmax spsumsqk | |
519 spcumprod spinv spmin | |
520 | |
521 ** Improvements to the debugger. | |
522 | |
523 The interactive debugging features have been improved. Stopping | |
524 on statements with dbstop should work correctly now. Stepping | |
525 into and over functions, and stepping one statement at a time | |
526 (with dbstep) now works. Moving up and down the call stack with | |
527 dbup and dbdown now works. The dbstack function is now available | |
528 to print the current function call stack. The new dbquit function | |
529 is available to exit the debugging mode. | |
530 | |
531 ** Improved traceback error messages. | |
532 | |
533 Traceback error messages are much more concise and easier to | |
534 understand. They now display information about the function call | |
535 stack instead of the stack of all statements that were active at | |
536 the point of the error. | |
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537 |
8737 | 538 ** Object Oriented Programming. |
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539 |
8737 | 540 Octave now includes OOP features and the user can create their own |
541 class objects and overloaded functions and operators. For | |
542 example, all methods of a class called "myclass" will be found in | |
543 a directory "@myclass" on the users path. The class specific | |
544 versions of functions and operators take precedence over the | |
545 generic versions of these functions. | |
546 | |
547 New functions related to OOP include | |
7189 | 548 |
8737 | 549 class inferiorto isobject loadobj methods superiorto |
550 | |
551 See the Octave manual for more details. | |
7038 | 552 |
8747 | 553 ** Parsing of Command-style Functions. |
554 | |
555 Octave now parses command-style functions without needing to first | |
556 declare them with "mark_as_command". The rules for recognizing a | |
557 command-style function calls are | |
558 | |
559 * A command must appear as the first word in a statement, | |
560 followed by a space. | |
561 | |
562 * The first character after the space must not be '=' or '(' | |
563 | |
564 * The next token after the space must not look like a binary | |
565 operator. | |
566 | |
567 These rules should be mostly compatible with the way Matlab parses | |
568 command-style function calls and allow users to define commands in | |
569 .m files without having to mark them as commands. | |
570 | |
571 Note that previous versions of Octave allowed expressions like | |
572 | |
573 x = load -text foo.dat | |
574 | |
575 but an expression like this will now generate a parse error. In | |
576 order to assign the value returned by a function to a variable, | |
577 you must use the normal function call syntax: | |
578 | |
579 x = load ("-text", "foo.dat"); | |
580 | |
8737 | 581 ** Block comments. |
582 | |
8747 | 583 Commented code can be between matching "#{" and "#}" or "%{" and |
584 "%}" markers, even if the commented code spans several line. This | |
585 allows blocks code to be commented, without needing to comment | |
586 each line. For example, | |
5814 | 587 |
8747 | 588 function [s, t] = func (x, y) |
589 s = 2 * x; | |
590 #{ | |
591 s *= y; | |
592 t = y + x; | |
593 #} | |
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594 endfunction |
5814 | 595 |
8747 | 596 the lines "s *= y;" and "t = y + x" will not be executed. |
8737 | 597 |
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598 ** If any subfunction in a file ends with "end" or "endfunction", then |
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599 they all must end that way. Previously, Octave accepted |
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600 |
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601 function main () |
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602 ... |
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603 # no endfunction here. |
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604 function sub () |
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605 ... |
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606 endfunction |
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607 |
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608 but this is no longer allowed. |
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609 |
8737 | 610 ** Special treatment in the parser of expressions like "a' * b". |
2452 | 611 |
8737 | 612 In these cases the transpose is no longer explicitly formed and |
613 BLAS libraries are called with the transpose flagged, | |
614 significantly improving performance for these kinds of | |
615 operations. | |
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616 |
8737 | 617 ** Single Precision data type. |
2452 | 618 |
8737 | 619 Octave now includes a single precision data type. Single |
620 precision variables can be created with the "single" command, or | |
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621 from functions like ones, eye, etc. For example, |
5995 | 622 |
8737 | 623 single (1) |
624 ones (2, 2, "single") | |
625 zeros (2, 2, "single") | |
626 eye (2, 2, "single") | |
627 Inf (2, 2, "single") | |
628 NaN (2, 2, "single") | |
629 NA (2, 2, "single") | |
7279 | 630 |
8737 | 631 all create single precision variables. For compatibility with |
632 Matlab, mixed double/single precision operators and functions | |
633 return single precision types. | |
634 | |
635 As a consequence of this addition to Octave the internal | |
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636 representation of the double precision NA value has changed, and |
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637 so users that make use of data generated by Octave with R or |
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638 visa-versa are warned that compatibility might not be assured. |
7279 | 639 |
8737 | 640 ** Improved array indexing. |
641 | |
642 The underlying code used for indexing of arrays has been | |
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643 completely rewritten and indexing is now significantly faster. |
8737 | 644 |
8755 | 645 ** Improved memory management. |
646 | |
647 Octave will now attempt to share data in some cases where previously | |
648 a copy would be made, such as certain array slicing operations or | |
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649 conversions between cells, structs and cs-lists. This usually reduces |
8755 | 650 both time and memory consumption. |
9128 | 651 Also, Octave will now attempt to detect and optimize usage of a vector |
652 as a stack, when elements are being repeatedly inserted at/removed from | |
653 the end of the vector. | |
8755 | 654 |
8738 | 655 ** Improved performance for reduction operations. |
656 | |
8755 | 657 The performance of the sum, prod, sumsq, cumsum, cumprod, any, all, |
658 max and min functions has been significantly improved. | |
8738 | 659 |
9006 | 660 ** Sorting and searching. |
661 | |
662 The performance of sort has been improved, especially when sorting | |
10453 | 663 indices are requested. An efficient built-in issorted |
664 implementation was added. The sortrows function now uses a more | |
665 efficient algorithm, especially in the homegeneous case. The lookup | |
666 function is now a built-in function performing a binary search, | |
667 optimized for long runs of close elements. Lookup also works with | |
668 cell arrays of strings. | |
9006 | 669 |
670 ** Range arithmetics | |
671 | |
10453 | 672 For some operations on ranges, Octave will attempt to keep the |
673 result as a range. These include negation, adding a scalar, | |
674 subtracting a scalar, and multiplying by a scalar. Ranges with zero | |
675 increment are allowed and can be constructed using the built-in | |
676 function `ones'. | |
9006 | 677 |
678 ** Various performance improvements. | |
679 | |
10453 | 680 Performance of a number of other built-in operations and functions |
681 was improved, including: | |
9006 | 682 |
683 * logical operations | |
684 * comparison operators | |
685 * element-wise power | |
686 * accumarray | |
687 * cellfun | |
688 * isnan | |
689 * isinf | |
690 * isfinite | |
691 * nchoosek | |
692 * repmat | |
693 * strcmp | |
694 | |
8737 | 695 ** 64-bit integer arithmetic. |
696 | |
697 Arithmetic with 64-bit integers (int64 and uint64 types) is fully | |
698 supported, with saturation semantics like the other integer types. | |
699 Performance of most integer arithmetic operations has been | |
700 improved by using integer arithmetic directly. Previously, Octave | |
701 performed integer math with saturation semantics by converting the | |
702 operands to double precision, performing the operation, and then | |
703 converting the result back to an integer value, truncating if | |
704 necessary. | |
705 | |
8885 | 706 ** Diagonal and permutation matrices. |
707 | |
708 The interpreter can now treat diagonal and permutation matrices as | |
709 special objects that store only the non-zero elements, rather than | |
710 general full matrices. Therefore, it is now possible to construct | |
711 and use these matrices in linear algebra without suffering a | |
712 performance penalty due to storing large numbers of zero elements. | |
713 | |
714 ** Improvements to fsolve. | |
715 | |
716 The fsolve function now accepts an option structure argument (see | |
717 also the optimset function). The INFO values returned from fsolve | |
718 have changed to be compatible with Matlab's fsolve function. | |
719 Additionally, fsolve is now able to solve overdetermined systems, | |
720 complex-differentiable complex systems, systems with a sparse | |
721 jacobian and can work in single precision if given single precision | |
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722 inputs. It can also be called recursively. |
8885 | 723 |
8737 | 724 ** Improvements to the norm function. |
725 | |
726 The norm function is now able to compute row or column norms of a | |
727 matrix in a single call, as well as general matrix p-norms. | |
728 | |
729 ** New functions for computing some eigenvalues or singular values. | |
730 | |
731 The eigs and svds functions have been included in Octave. These | |
732 functions require the ARPACK library (now distributed under a | |
733 GPL-compatible license). | |
734 | |
735 ** New QR and Cholesky factorization updating functions. | |
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736 |
8737 | 737 choldelete cholshift qrdelete qrshift |
738 cholinsert cholupdate qrinsert qrupdate | |
739 | |
740 ** New quadrature functions. | |
741 | |
742 dblquad quadgk quadv triplequad | |
743 | |
8885 | 744 ** New functions for reading and writing images. |
745 | |
746 The imwrite and imread functions have been included in Octave. | |
747 These functions require the GraphicsMagick library. The new | |
748 function imfinfo provides information about an image file (size, | |
749 type, colors, etc.) | |
750 | |
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751 ** The input_event_hook function has been replaced by the pair of |
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752 functions add_input_event_hook and remove_input_event_hook so that |
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753 more than one hook function may be installed at a time. |
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754 |
8737 | 755 ** Other miscellaneous new functions. |
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756 |
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757 addtodate hypot reallog |
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758 bicgstab idivide realpow |
9006 | 759 cellslices info realsqrt |
760 cgs interp1q rectint | |
761 command_line_path isdebugmode regexptranslate | |
762 contrast isfloat restoredefaultpath | |
763 convn isstrprop roundb | |
764 cummin log1p rundemos | |
765 cummax lsqnonneg runlength | |
766 datetick matlabroot saveobj | |
767 display namelengthmax spaugment | |
768 expm1 nargoutchk strchr | |
769 filemarker pathdef strvcat | |
770 fstat perl subspace | |
771 full prctile symvar | |
772 fzero quantile treelayout | |
773 genvarname re_read_readline_init_file validatestring | |
774 histc | |
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775 |
8885 | 776 ** Changes to strcat. |
777 | |
778 The strcat function is now compatible with Matlab's strcat | |
779 function, which removes trailing whitespace when concatenating | |
780 character strings. For example | |
781 | |
782 strcat ('foo ', 'bar') | |
783 ==> 'foobar' | |
784 | |
785 The new function cstrcat provides the previous behavior of | |
786 Octave's strcat. | |
787 | |
788 ** Improvements to the help functions. | |
789 | |
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790 The help system has been mostly re-implemented in .m files to make |
8885 | 791 it easier to modify. Performance of the lookfor function has been |
792 greatly improved by caching the help text from all functions that | |
793 are distributed with Octave. The pkg function has been modified | |
794 to generate cache files for external packages when they are | |
795 installed. | |
796 | |
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797 ** Deprecated functions. |
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798 |
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799 The following functions were deprecated in Octave 3.0 and will be |
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800 removed from Octave 3.4 (or whatever version is the second major |
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801 release after 3.0): |
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802 |
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803 beta_cdf geometric_pdf pascal_pdf |
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804 beta_inv geometric_rnd pascal_rnd |
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805 beta_pdf hypergeometric_cdf poisson_cdf |
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806 beta_rnd hypergeometric_inv poisson_inv |
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807 binomial_cdf hypergeometric_pdf poisson_pdf |
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808 binomial_inv hypergeometric_rnd poisson_rnd |
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809 binomial_pdf intersection polyinteg |
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810 binomial_rnd is_bool setstr |
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811 chisquare_cdf is_complex struct_contains |
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812 chisquare_inv is_list struct_elements |
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813 chisquare_pdf is_matrix t_cdf |
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814 chisquare_rnd is_scalar t_inv |
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815 clearplot is_square t_pdf |
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816 clg is_stream t_rnd |
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817 com2str is_struct uniform_cdf |
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818 exponential_cdf is_symmetric uniform_inv |
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819 exponential_inv is_vector uniform_pdf |
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820 exponential_pdf isstr uniform_rnd |
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821 exponential_rnd lognormal_cdf weibcdf |
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822 f_cdf lognormal_inv weibinv |
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823 f_inv lognormal_pdf weibpdf |
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824 f_pdf lognormal_rnd weibrnd |
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825 f_rnd meshdom weibull_cdf |
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826 gamma_cdf normal_cdf weibull_inv |
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827 gamma_inv normal_inv weibull_pdf |
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828 gamma_pdf normal_pdf weibull_rnd |
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829 gamma_rnd normal_rnd wiener_rnd |
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830 geometric_cdf pascal_cdf |
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831 geometric_inv pascal_inv |
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832 |
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833 The following functions are now deprecated in Octave 3.2 and will |
11112
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834 be removed from Octave 3.6 (or whatever version is the second major |
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835 release after 3.2): |
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836 |
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837 create_set spcholinv spmax |
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838 dmult spcumprod spmin |
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839 iscommand spcumsum spprod |
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840 israwcommand spdet spqr |
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841 lchol spdiag spsum |
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842 loadimage spfind spsumsq |
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843 mark_as_command spinv str2mat |
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844 mark_as_rawcommand spkron unmark_command |
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845 spatan2 splchol unmark_rawcommand |
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846 spchol split |
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847 spchol2inv splu |
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848 |
7990
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849 See NEWS.3 for old news. |