Mercurial > octave
annotate NEWS @ 11109:41d18f6342f9
remove image_viewer function
| author | John W. Eaton <jwe@octave.org> |
|---|---|
| date | Mon, 18 Oct 2010 14:15:06 -0400 |
| parents | 07b4cd795742 |
| children | 84ad75921e35 |
| rev | line source |
|---|---|
| 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 | |
| 10453 | 228 ** The list datatype, deprecated since the introduction of cells, has |
| 229 been removed. | |
| 10276 | 230 |
| 10453 | 231 ** The accumarray function has been optimized and is now significantly |
| 232 faster in certain important cases. | |
| 10054 | 233 |
| 10292 | 234 ** The behavior of isreal and isnumeric functions was changed to be more |
| 235 Matlab-compatible. | |
| 236 | |
| 10406 | 237 ** The integer math & conversion warnings (Octave:int-convert-nan, |
| 238 Octave:int-convert-non-int-val, Octave:int-convert-overflow, | |
| 239 Octave:int-math-overflow) have been removed. | |
| 240 | |
| 10453 | 241 ** rem and mod are now built-in functions. They also handle integer |
| 242 types efficiently using integer arithmetic. | |
| 10437 | 243 |
| 10536 | 244 ** Sparse indexing and indexed assignment has been mostly rewritten. |
| 245 Since Octave uses compressed column storage for sparse matrices, | |
| 246 major attention is devoted to operations manipulating whole columns. | |
| 247 Such operations are now significantly faster, as well as some other | |
| 248 important cases. | |
| 249 | |
| 250 Further, it is now possible to pre-allocate a sparse matrix and | |
| 251 subsequently fill it by assignments, provided they meet certain | |
| 252 conditions. For more information, consult the `spalloc' function, | |
| 253 which is no longer a mere dummy. Consequently, nzmax and nnz are no | |
| 254 longer always equal in Octave. Octave may also produce a matrix with | |
| 255 nnz < nzmax as a result of other operations, so you should | |
| 256 consistently use nnz unless you really want to use nzmax | |
| 257 (i.e. the space allocated for nonzero elements). | |
| 258 | |
| 259 Sparse concatenation is also affected, and concatenating sparse | |
| 260 matrices, especially larger collections, is now significantly more | |
| 261 efficient. This applies to both the [] operator and the | |
| 262 cat/vertcat/horzcat functions. | |
| 263 | |
| 10639 | 264 ** It is now possible to optionally employ the xGESDD LAPACK drivers for |
| 265 computing the singular value decomposition using svd(), instead of | |
| 266 the default xGESVD, using the configuration pseudo-variable | |
| 267 svd_driver. The xGESDD driver can be up to 6x times faster when | |
| 268 singular vectors are requested, but is reported to be somewhat less | |
| 269 robust on highly ill-conditioned matrices. | |
| 270 | |
| 271 ** Configuration pseudo-variables, such as page_screen_output or | |
| 272 confirm_recursive_rmdir (or the above mentioned svd_driver), now | |
| 273 accept a "local" option as second argument, requesting the change | |
| 274 to be undone when current function returns: | |
| 275 | |
| 276 function [status, msg] = rm_rf (dir) | |
| 277 confirm_recursive_rmdir (false, "local"); | |
| 278 [status, msg] = rmdir (dir, "s"); | |
| 279 ... | |
| 280 endfunction | |
| 281 | |
| 282 Upon return, confirm_recursive_rmdir will be restored to the value | |
| 283 it had on entry to the function, even if there were subsequent | |
| 284 changes to the variable in function rm_rf or any of the functions | |
| 285 it calls. | |
| 286 | |
| 10774 | 287 ** pkg now accepts a -forge option for downloading and installing packages |
| 288 from OctaveForge automatically. For example, | |
| 289 | |
| 290 pkg install -forge general | |
| 291 | |
| 292 will automatically download the latest release of the general package and | |
| 293 attempt to install it. No automatic resolving of dependencies is provided. | |
| 294 Further, | |
| 10639 | 295 |
| 10774 | 296 pkg list -forge |
| 297 | |
| 298 can be used to list all available packages. | |
| 299 | |
| 300 ** The internal data representation of structs has been completely rewritten | |
| 301 to make certain optimizations feasible. The field data can now be shared | |
| 302 between structs with equal keys but different dimensions or values, making | |
| 303 operations that preserve the fields faster. Economized storage is now used | |
| 304 for scalar structs (just like most other scalars), making their usage more | |
| 305 memory-efficient. Certain array-like operations on structs (concatenation, | |
| 306 uniform cellfun, num2cell) have gained a significant speed-up. | |
| 307 Additionally, the octave_scalar_map class now provides a simpler interface | |
| 308 to work with scalar structs within a C++ DLD function. | |
| 10639 | 309 |
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310 ** Two new formats are available for displaying numbers: |
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311 format short eng |
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312 format long eng |
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313 Both display numbers in engineering notation, i.e., mantissa + exponent |
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314 where the exponent is a multiple of 3. |
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315 |
| 10829 | 316 ** The following new functions were added: |
| 317 | |
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318 accumdim erfcx luupdate ppder rsf2csf |
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319 bitpack fileread merge ppint sizemax |
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320 bitunpack fminbnd nfields ppjumps strread |
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321 blkmm fskipl nth_element pqpnonneg textread |
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322 cbrt ifelse onCleanup randi whitebg |
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323 chop ishermitian pbaspect repelems |
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324 daspect isindex powerset reset |
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325 |
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326 ** Using the image function to view images with external programs such |
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327 as display, xv, and xloadimage is no longer supported. The |
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328 image_viewer function has also been removed. |
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329 |
| 10873 | 330 ** The behavior of struct assignments to non-struct values has been changed. |
| 331 Previously, it was possible to overwrite an arbitrary value: | |
| 332 | |
| 333 a = 1; | |
| 334 a.x = 2; | |
| 335 | |
| 336 This is no longer possible unless a is an empty matrix or cell array. | |
| 10938 | 337 |
| 338 ** By popular demand, dlmread has been extended to allow specifying a custom | |
| 339 value for empty fields and also to accept file IDs opened by fopen. Likewise, | |
| 340 dlmwrite can write to file IDs. | |
| 10829 | 341 |
| 10966 | 342 ** Octave can now optimize away the interpreter overhead of an anonymous function |
| 343 handle, if the function simply calls another function or handle with some of its | |
| 344 parameters bound to certain values. Example: | |
| 345 | |
| 346 f = @(x) sum (x, 1); | |
| 347 | |
| 348 When f is called, the call is forwarded to @sum with the constant 1 appended, and | |
| 349 the anonymous function call does not occur on the call stack. | |
| 10829 | 350 |
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351 Summary of important user-visible changes for version 3.2: |
| 5913 | 352 --------------------------------------------------------- |
| 2452 | 353 |
| 8737 | 354 ** Compatibility with Matlab graphics has been improved. |
| 6329 | 355 |
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356 The hggroup object and associated listener callback functions have |
| 8737 | 357 been added allowing the inclusion of group objects. Data sources |
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358 have been added to these group objects such that |
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359 |
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360 x = 0:0.1:10; |
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361 y = sin (x); |
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362 plot (x, y, "ydatasource", "y"); |
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363 for i = 1 : 100 |
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364 pause(0.1) |
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365 y = sin (x + 0.1 * i); |
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366 refreshdata(); |
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367 endfor |
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368 |
| 8737 | 369 works as expected. This capability has be used to introduce |
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370 stem-series, bar-series, etc., objects for better Matlab |
| 8737 | 371 compatibility. |
| 372 | |
| 373 ** New graphics functions: | |
| 374 | |
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375 addlistener ezcontour gcbo refresh |
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376 addproperty ezcontourf ginput refreshdata |
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377 allchild ezmesh gtext specular |
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378 available_backends ezmeshc intwarning surfl |
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379 backend ezplot ishghandle trisurf |
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380 cla ezplot3 isocolors waitforbuttonpress |
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381 clabel ezpolar isonormals |
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382 comet ezsurf isosurface |
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383 dellistener findall linkprop |
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384 diffuse gcbf plotmatrix |
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385 |
| 8737 | 386 ** New experimental OpenGL/FLTK based plotting system. |
| 387 | |
| 388 An experimental plotting system based on OpenGL and the FLTK | |
| 389 toolkit is now part of Octave. This backend is disabled by | |
| 390 default. You can switch to using it with the command | |
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391 |
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392 backend ("fltk") |
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393 |
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394 for all future figures or for a particular figure with the command |
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395 |
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396 backend (h, "fltk") |
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397 |
| 8737 | 398 where "h" is a valid figure handle. Please note that this backend |
| 399 does not yet support text objects. Obviously, this is a necessary | |
| 400 feature before it can be considered usable. We are looking for | |
| 401 volunteers to help implement this missing feature. | |
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402 |
| 8737 | 403 ** Functions providing direct access to gnuplot have been removed. |
| 404 | |
|
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405 The functions __gnuplot_plot__, __gnuplot_set__, __gnuplot_raw__, |
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406 __gnuplot_show__, __gnuplot_replot__, __gnuplot_splot__, |
| 8737 | 407 __gnuplot_save_data__ and __gnuplot_send_inline_data__ have been |
| 408 removed from Octave. These function were incompatible with the | |
| 409 high level graphics handle code. | |
| 6329 | 410 |
| 8885 | 411 ** The Control, Finance and Quaternion functions have been removed. |
| 412 | |
| 413 These functions are now available as separate packages from | |
| 414 | |
| 415 http://octave.sourceforge.net/packages.html | |
| 416 | |
| 417 and can be reinstalled using the Octave package manager (see | |
| 418 the pkg function). | |
| 419 | |
| 420 ** Specific sparse matrix functions removed. | |
| 421 | |
| 422 The following functions, which handled only sparse matrices have | |
| 423 been removed. Instead of calling these functions directly, you | |
| 424 should use the corresponding function without the "sp" prefix. | |
| 8737 | 425 |
| 8885 | 426 spatan2 spcumsum spkron spprod |
| 427 spchol spdet splchol spqr | |
| 428 spchol2inv spdiag splu spsum | |
| 429 spcholinv spfind spmax spsumsqk | |
| 430 spcumprod spinv spmin | |
| 431 | |
| 432 ** Improvements to the debugger. | |
| 433 | |
| 434 The interactive debugging features have been improved. Stopping | |
| 435 on statements with dbstop should work correctly now. Stepping | |
| 436 into and over functions, and stepping one statement at a time | |
| 437 (with dbstep) now works. Moving up and down the call stack with | |
| 438 dbup and dbdown now works. The dbstack function is now available | |
| 439 to print the current function call stack. The new dbquit function | |
| 440 is available to exit the debugging mode. | |
| 441 | |
| 442 ** Improved traceback error messages. | |
| 443 | |
| 444 Traceback error messages are much more concise and easier to | |
| 445 understand. They now display information about the function call | |
| 446 stack instead of the stack of all statements that were active at | |
| 447 the point of the error. | |
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448 |
| 8737 | 449 ** Object Oriented Programming. |
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450 |
| 8737 | 451 Octave now includes OOP features and the user can create their own |
| 452 class objects and overloaded functions and operators. For | |
| 453 example, all methods of a class called "myclass" will be found in | |
| 454 a directory "@myclass" on the users path. The class specific | |
| 455 versions of functions and operators take precedence over the | |
| 456 generic versions of these functions. | |
| 457 | |
| 458 New functions related to OOP include | |
| 7189 | 459 |
| 8737 | 460 class inferiorto isobject loadobj methods superiorto |
| 461 | |
| 462 See the Octave manual for more details. | |
| 7038 | 463 |
| 8747 | 464 ** Parsing of Command-style Functions. |
| 465 | |
| 466 Octave now parses command-style functions without needing to first | |
| 467 declare them with "mark_as_command". The rules for recognizing a | |
| 468 command-style function calls are | |
| 469 | |
| 470 * A command must appear as the first word in a statement, | |
| 471 followed by a space. | |
| 472 | |
| 473 * The first character after the space must not be '=' or '(' | |
| 474 | |
| 475 * The next token after the space must not look like a binary | |
| 476 operator. | |
| 477 | |
| 478 These rules should be mostly compatible with the way Matlab parses | |
| 479 command-style function calls and allow users to define commands in | |
| 480 .m files without having to mark them as commands. | |
| 481 | |
| 482 Note that previous versions of Octave allowed expressions like | |
| 483 | |
| 484 x = load -text foo.dat | |
| 485 | |
| 486 but an expression like this will now generate a parse error. In | |
| 487 order to assign the value returned by a function to a variable, | |
| 488 you must use the normal function call syntax: | |
| 489 | |
| 490 x = load ("-text", "foo.dat"); | |
| 491 | |
| 8737 | 492 ** Block comments. |
| 493 | |
| 8747 | 494 Commented code can be between matching "#{" and "#}" or "%{" and |
| 495 "%}" markers, even if the commented code spans several line. This | |
| 496 allows blocks code to be commented, without needing to comment | |
| 497 each line. For example, | |
| 5814 | 498 |
| 8747 | 499 function [s, t] = func (x, y) |
| 500 s = 2 * x; | |
| 501 #{ | |
| 502 s *= y; | |
| 503 t = y + x; | |
| 504 #} | |
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505 endfunction |
| 5814 | 506 |
| 8747 | 507 the lines "s *= y;" and "t = y + x" will not be executed. |
| 8737 | 508 |
| 509 ** Special treatment in the parser of expressions like "a' * b". | |
| 2452 | 510 |
| 8737 | 511 In these cases the transpose is no longer explicitly formed and |
| 512 BLAS libraries are called with the transpose flagged, | |
| 513 significantly improving performance for these kinds of | |
| 514 operations. | |
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515 |
| 8737 | 516 ** Single Precision data type. |
| 2452 | 517 |
| 8737 | 518 Octave now includes a single precision data type. Single |
| 519 precision variables can be created with the "single" command, or | |
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520 from functions like ones, eye, etc. For example, |
| 5995 | 521 |
| 8737 | 522 single (1) |
| 523 ones (2, 2, "single") | |
| 524 zeros (2, 2, "single") | |
| 525 eye (2, 2, "single") | |
| 526 Inf (2, 2, "single") | |
| 527 NaN (2, 2, "single") | |
| 528 NA (2, 2, "single") | |
| 7279 | 529 |
| 8737 | 530 all create single precision variables. For compatibility with |
| 531 Matlab, mixed double/single precision operators and functions | |
| 532 return single precision types. | |
| 533 | |
| 534 As a consequence of this addition to Octave the internal | |
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535 representation of the double precision NA value has changed, and |
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536 so users that make use of data generated by Octave with R or |
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537 visa-versa are warned that compatibility might not be assured. |
| 7279 | 538 |
| 8737 | 539 ** Improved array indexing. |
| 540 | |
| 541 The underlying code used for indexing of arrays has been | |
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542 completely rewritten and indexing is now significantly faster. |
| 8737 | 543 |
| 8755 | 544 ** Improved memory management. |
| 545 | |
| 546 Octave will now attempt to share data in some cases where previously | |
| 547 a copy would be made, such as certain array slicing operations or | |
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548 conversions between cells, structs and cs-lists. This usually reduces |
| 8755 | 549 both time and memory consumption. |
| 9128 | 550 Also, Octave will now attempt to detect and optimize usage of a vector |
| 551 as a stack, when elements are being repeatedly inserted at/removed from | |
| 552 the end of the vector. | |
| 8755 | 553 |
| 8738 | 554 ** Improved performance for reduction operations. |
| 555 | |
| 8755 | 556 The performance of the sum, prod, sumsq, cumsum, cumprod, any, all, |
| 557 max and min functions has been significantly improved. | |
| 8738 | 558 |
| 9006 | 559 ** Sorting and searching. |
| 560 | |
| 561 The performance of sort has been improved, especially when sorting | |
| 10453 | 562 indices are requested. An efficient built-in issorted |
| 563 implementation was added. The sortrows function now uses a more | |
| 564 efficient algorithm, especially in the homegeneous case. The lookup | |
| 565 function is now a built-in function performing a binary search, | |
| 566 optimized for long runs of close elements. Lookup also works with | |
| 567 cell arrays of strings. | |
| 9006 | 568 |
| 569 ** Range arithmetics | |
| 570 | |
| 10453 | 571 For some operations on ranges, Octave will attempt to keep the |
| 572 result as a range. These include negation, adding a scalar, | |
| 573 subtracting a scalar, and multiplying by a scalar. Ranges with zero | |
| 574 increment are allowed and can be constructed using the built-in | |
| 575 function `ones'. | |
| 9006 | 576 |
| 577 ** Various performance improvements. | |
| 578 | |
| 10453 | 579 Performance of a number of other built-in operations and functions |
| 580 was improved, including: | |
| 9006 | 581 |
| 582 * logical operations | |
| 583 * comparison operators | |
| 584 * element-wise power | |
| 585 * accumarray | |
| 586 * cellfun | |
| 587 * isnan | |
| 588 * isinf | |
| 589 * isfinite | |
| 590 * nchoosek | |
| 591 * repmat | |
| 592 * strcmp | |
| 593 | |
| 8737 | 594 ** 64-bit integer arithmetic. |
| 595 | |
| 596 Arithmetic with 64-bit integers (int64 and uint64 types) is fully | |
| 597 supported, with saturation semantics like the other integer types. | |
| 598 Performance of most integer arithmetic operations has been | |
| 599 improved by using integer arithmetic directly. Previously, Octave | |
| 600 performed integer math with saturation semantics by converting the | |
| 601 operands to double precision, performing the operation, and then | |
| 602 converting the result back to an integer value, truncating if | |
| 603 necessary. | |
| 604 | |
| 8885 | 605 ** Diagonal and permutation matrices. |
| 606 | |
| 607 The interpreter can now treat diagonal and permutation matrices as | |
| 608 special objects that store only the non-zero elements, rather than | |
| 609 general full matrices. Therefore, it is now possible to construct | |
| 610 and use these matrices in linear algebra without suffering a | |
| 611 performance penalty due to storing large numbers of zero elements. | |
| 612 | |
| 613 ** Improvements to fsolve. | |
| 614 | |
| 615 The fsolve function now accepts an option structure argument (see | |
| 616 also the optimset function). The INFO values returned from fsolve | |
| 617 have changed to be compatible with Matlab's fsolve function. | |
| 618 Additionally, fsolve is now able to solve overdetermined systems, | |
| 619 complex-differentiable complex systems, systems with a sparse | |
| 620 jacobian and can work in single precision if given single precision | |
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621 inputs. It can also be called recursively. |
| 8885 | 622 |
| 8737 | 623 ** Improvements to the norm function. |
| 624 | |
| 625 The norm function is now able to compute row or column norms of a | |
| 626 matrix in a single call, as well as general matrix p-norms. | |
| 627 | |
| 628 ** New functions for computing some eigenvalues or singular values. | |
| 629 | |
| 630 The eigs and svds functions have been included in Octave. These | |
| 631 functions require the ARPACK library (now distributed under a | |
| 632 GPL-compatible license). | |
| 633 | |
| 634 ** New QR and Cholesky factorization updating functions. | |
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635 |
| 8737 | 636 choldelete cholshift qrdelete qrshift |
| 637 cholinsert cholupdate qrinsert qrupdate | |
| 638 | |
| 639 ** New quadrature functions. | |
| 640 | |
| 641 dblquad quadgk quadv triplequad | |
| 642 | |
| 8885 | 643 ** New functions for reading and writing images. |
| 644 | |
| 645 The imwrite and imread functions have been included in Octave. | |
| 646 These functions require the GraphicsMagick library. The new | |
| 647 function imfinfo provides information about an image file (size, | |
| 648 type, colors, etc.) | |
| 649 | |
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650 ** The input_event_hook function has been replaced by the pair of |
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651 functions add_input_event_hook and remove_input_event_hook so that |
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652 more than one hook function may be installed at a time. |
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653 |
| 8737 | 654 ** Other miscellaneous new functions. |
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655 |
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656 addtodate hypot reallog |
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657 bicgstab idivide realpow |
| 9006 | 658 cellslices info realsqrt |
| 659 cgs interp1q rectint | |
| 660 command_line_path isdebugmode regexptranslate | |
| 661 contrast isfloat restoredefaultpath | |
| 662 convn isstrprop roundb | |
| 663 cummin log1p rundemos | |
| 664 cummax lsqnonneg runlength | |
| 665 datetick matlabroot saveobj | |
| 666 display namelengthmax spaugment | |
| 667 expm1 nargoutchk strchr | |
| 668 filemarker pathdef strvcat | |
| 669 fstat perl subspace | |
| 670 full prctile symvar | |
| 671 fzero quantile treelayout | |
| 672 genvarname re_read_readline_init_file validatestring | |
| 673 histc | |
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674 |
| 8885 | 675 ** Changes to strcat. |
| 676 | |
| 677 The strcat function is now compatible with Matlab's strcat | |
| 678 function, which removes trailing whitespace when concatenating | |
| 679 character strings. For example | |
| 680 | |
| 681 strcat ('foo ', 'bar') | |
| 682 ==> 'foobar' | |
| 683 | |
| 684 The new function cstrcat provides the previous behavior of | |
| 685 Octave's strcat. | |
| 686 | |
| 687 ** Improvements to the help functions. | |
| 688 | |
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689 The help system has been mostly re-implemented in .m files to make |
| 8885 | 690 it easier to modify. Performance of the lookfor function has been |
| 691 greatly improved by caching the help text from all functions that | |
| 692 are distributed with Octave. The pkg function has been modified | |
| 693 to generate cache files for external packages when they are | |
| 694 installed. | |
| 695 | |
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696 ** Deprecated functions. |
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697 |
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698 The following functions were deprecated in Octave 3.0 and will be |
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699 removed in Octave 3.4 (or whatever version is the second major |
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700 release after 3.0): |
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701 |
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702 beta_cdf geometric_pdf pascal_pdf |
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703 beta_inv geometric_rnd pascal_rnd |
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704 beta_pdf hypergeometric_cdf poisson_cdf |
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705 beta_rnd hypergeometric_inv poisson_inv |
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706 binomial_cdf hypergeometric_pdf poisson_pdf |
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707 binomial_inv hypergeometric_rnd poisson_rnd |
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708 binomial_pdf intersection polyinteg |
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709 binomial_rnd is_bool setstr |
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710 chisquare_cdf is_complex struct_contains |
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711 chisquare_inv is_list struct_elements |
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712 chisquare_pdf is_matrix t_cdf |
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713 chisquare_rnd is_scalar t_inv |
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714 clearplot is_square t_pdf |
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715 clg is_stream t_rnd |
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716 com2str is_struct uniform_cdf |
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717 exponential_cdf is_symmetric uniform_inv |
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718 exponential_inv is_vector uniform_pdf |
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719 exponential_pdf isstr uniform_rnd |
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720 exponential_rnd lognormal_cdf weibcdf |
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721 f_cdf lognormal_inv weibinv |
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722 f_inv lognormal_pdf weibpdf |
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723 f_pdf lognormal_rnd weibrnd |
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724 f_rnd meshdom weibull_cdf |
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725 gamma_cdf normal_cdf weibull_inv |
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726 gamma_inv normal_inv weibull_pdf |
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727 gamma_pdf normal_pdf weibull_rnd |
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728 gamma_rnd normal_rnd wiener_rnd |
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729 geometric_cdf pascal_cdf |
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730 geometric_inv pascal_inv |
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731 |
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732 The following functions are now deprecated in Octave 3.2 and will |
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733 be removed in Octave 3.6 (or whatever version is the second major |
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734 release after 3.2): |
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735 |
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736 create_set spcholinv spmax |
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737 dmult spcumprod spmin |
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738 iscommand spcumsum spprod |
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739 israwcommand spdet spqr |
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740 lchol spdiag spsum |
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741 loadimage spfind spsumsq |
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742 mark_as_command spinv str2mat |
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743 mark_as_rawcommand spkron unmark_command |
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744 spatan2 splchol unmark_rawcommand |
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745 spchol split |
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746 spchol2inv splu |
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747 |
|
7990
86dae6e5b83c
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748 See NEWS.3 for old news. |