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annotate NEWS @ 9589:8e42bb4ad34d
update NEWS
author | Jaroslav Hajek <highegg@gmail.com> |
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date | Sun, 30 Aug 2009 21:56:18 +0200 |
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9352 | 1 Summary of important user-visible changes for version 3.3: |
2 --------------------------------------------------------- | |
3 | |
4 ** The `lookup' function was extended to be more useful for general-purpose | |
5 binary searching. Using this improvement, the ismember function was | |
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6 rewritten for significantly better performance. |
9352 | 7 |
8 ** Real, integer and logical matrices, when used in indexing, will now | |
9 cache the internal index_vector value (zero-based indices) when | |
10 successfully used as indices, eliminating the conversion penalty for | |
11 subsequent indexing by the same matrix. In particular, this means it is | |
12 no longer needed to avoid repeated indexing by logical arrays using | |
13 `find' for performance reasons. | |
14 | |
9480 | 15 ** sub2ind and ind2sub were reimplemented as compiled functions for better |
16 performance. These functions are now faster, can deliver more economized | |
17 results for ranges, and can reuse the index cache mechanism described in | |
18 previous paragraph. | |
19 | |
9449 | 20 ** The built-in function equivalents to associative operators (plus, times, |
21 mtimes, and, or) have been extended to accept multiple arguments. This | |
22 is especially useful for summing (multiplying, etc.) lists of objects | |
23 (of possibly distinct types): | |
9408 | 24 |
9449 | 25 matrix_sum = plus (matrix_list{:}); |
26 | |
27 ** The default behavior of assert (observed, expected) has been relaxed | |
28 to employ less strict checking that does not require the internals | |
29 of the values to match. This avoids previously valid tests from | |
30 breaking due to new internal classes introduced in future Octave | |
31 versions. | |
32 | |
33 For instance, all of these assertions were true in Octave 3.0.x | |
34 but false in 3.2.x due to new optimizations and improvements: | |
35 | |
36 assert (2*linspace (1, 5, 5), 2*(1:5)) | |
37 assert (zeros (0, 0), []) | |
38 assert (2*ones (1, 5), (2) (ones (1,5))) | |
9462 | 39 |
40 ** Function handles are now aware of overloaded functions. If a function | |
41 is overloaded, the handle determines at the time of its reference which | |
42 function to call. A non-overloaded version does not need to exist. | |
9408 | 43 |
9547 | 44 ** The operation-assignment operators +=, -=, *= and /= now behave more |
45 efficiently in certain cases. For instance, if m is a matrix and s | |
46 a scalar, then the statement | |
47 | |
48 m += s; | |
49 | |
50 will operate on m's data in-place if it is not shared by another variable, | |
51 usually increasing both time and memory efficiency. | |
52 | |
9558 | 53 Only selected common combinations are affected, namely: |
9547 | 54 |
55 matrix += matrix | |
56 matrix -= matrix | |
9558 | 57 matrix .*= matrix |
58 matrix ./= matrix | |
59 | |
9547 | 60 matrix += scalar |
61 matrix -= scalar | |
62 matrix *= scalar | |
63 matrix /= scalar | |
9558 | 64 |
9552 | 65 logical matrix |= logical matrix |
66 logical matrix &= logical matrix | |
9547 | 67 |
68 where matrix and scalar belong to the same class. The left-hand side must be | |
69 a simple variable reference. | |
9589 | 70 |
71 ** The effect of comparison operators (<,>,<=,>=) when applied to complex numbers | |
72 has changed to be consistent with the strict ordering defined by max, min and sort. | |
73 More specifically, complex numbers are compared by lexicographical comparison of | |
74 the pairs [abs(z), arg(z)]. Previously, only real parts were compared; this can be | |
75 trivially achieved by wrapping the operands in real(). | |
9547 | 76 |
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77 Summary of important user-visible changes for version 3.2: |
5913 | 78 --------------------------------------------------------- |
2452 | 79 |
8737 | 80 ** Compatibility with Matlab graphics has been improved. |
6329 | 81 |
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82 The hggroup object and associated listener callback functions have |
8737 | 83 been added allowing the inclusion of group objects. Data sources |
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84 have been added to these group objects such that |
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85 |
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86 x = 0:0.1:10; |
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87 y = sin (x); |
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88 plot (x, y, "ydatasource", "y"); |
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89 for i = 1 : 100 |
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90 pause(0.1) |
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91 y = sin (x + 0.1 * i); |
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92 refreshdata(); |
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93 endfor |
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94 |
8737 | 95 works as expected. This capability has be used to introduce |
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96 stem-series, bar-series, etc., objects for better Matlab |
8737 | 97 compatibility. |
98 | |
99 ** New graphics functions: | |
100 | |
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101 addlistener ezcontour gcbo refresh |
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102 addproperty ezcontourf ginput refreshdata |
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103 allchild ezmesh gtext specular |
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104 available_backends ezmeshc intwarning surfl |
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105 backend ezplot ishghandle trisurf |
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106 cla ezplot3 isocolors waitforbuttonpress |
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107 clabel ezpolar isonormals |
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108 comet ezsurf isosurface |
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109 dellistener findall linkprop |
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110 diffuse gcbf plotmatrix |
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111 |
8737 | 112 ** New experimental OpenGL/FLTK based plotting system. |
113 | |
114 An experimental plotting system based on OpenGL and the FLTK | |
115 toolkit is now part of Octave. This backend is disabled by | |
116 default. You can switch to using it with the command | |
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117 |
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118 backend ("fltk") |
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119 |
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120 for all future figures or for a particular figure with the command |
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121 |
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122 backend (h, "fltk") |
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123 |
8737 | 124 where "h" is a valid figure handle. Please note that this backend |
125 does not yet support text objects. Obviously, this is a necessary | |
126 feature before it can be considered usable. We are looking for | |
127 volunteers to help implement this missing feature. | |
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128 |
8737 | 129 ** Functions providing direct access to gnuplot have been removed. |
130 | |
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131 The functions __gnuplot_plot__, __gnuplot_set__, __gnuplot_raw__, |
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132 __gnuplot_show__, __gnuplot_replot__, __gnuplot_splot__, |
8737 | 133 __gnuplot_save_data__ and __gnuplot_send_inline_data__ have been |
134 removed from Octave. These function were incompatible with the | |
135 high level graphics handle code. | |
6329 | 136 |
8885 | 137 ** The Control, Finance and Quaternion functions have been removed. |
138 | |
139 These functions are now available as separate packages from | |
140 | |
141 http://octave.sourceforge.net/packages.html | |
142 | |
143 and can be reinstalled using the Octave package manager (see | |
144 the pkg function). | |
145 | |
146 ** Specific sparse matrix functions removed. | |
147 | |
148 The following functions, which handled only sparse matrices have | |
149 been removed. Instead of calling these functions directly, you | |
150 should use the corresponding function without the "sp" prefix. | |
8737 | 151 |
8885 | 152 spatan2 spcumsum spkron spprod |
153 spchol spdet splchol spqr | |
154 spchol2inv spdiag splu spsum | |
155 spcholinv spfind spmax spsumsqk | |
156 spcumprod spinv spmin | |
157 | |
158 ** Improvements to the debugger. | |
159 | |
160 The interactive debugging features have been improved. Stopping | |
161 on statements with dbstop should work correctly now. Stepping | |
162 into and over functions, and stepping one statement at a time | |
163 (with dbstep) now works. Moving up and down the call stack with | |
164 dbup and dbdown now works. The dbstack function is now available | |
165 to print the current function call stack. The new dbquit function | |
166 is available to exit the debugging mode. | |
167 | |
168 ** Improved traceback error messages. | |
169 | |
170 Traceback error messages are much more concise and easier to | |
171 understand. They now display information about the function call | |
172 stack instead of the stack of all statements that were active at | |
173 the point of the error. | |
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174 |
8737 | 175 ** Object Oriented Programming. |
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176 |
8737 | 177 Octave now includes OOP features and the user can create their own |
178 class objects and overloaded functions and operators. For | |
179 example, all methods of a class called "myclass" will be found in | |
180 a directory "@myclass" on the users path. The class specific | |
181 versions of functions and operators take precedence over the | |
182 generic versions of these functions. | |
183 | |
184 New functions related to OOP include | |
7189 | 185 |
8737 | 186 class inferiorto isobject loadobj methods superiorto |
187 | |
188 See the Octave manual for more details. | |
7038 | 189 |
8747 | 190 ** Parsing of Command-style Functions. |
191 | |
192 Octave now parses command-style functions without needing to first | |
193 declare them with "mark_as_command". The rules for recognizing a | |
194 command-style function calls are | |
195 | |
196 * A command must appear as the first word in a statement, | |
197 followed by a space. | |
198 | |
199 * The first character after the space must not be '=' or '(' | |
200 | |
201 * The next token after the space must not look like a binary | |
202 operator. | |
203 | |
204 These rules should be mostly compatible with the way Matlab parses | |
205 command-style function calls and allow users to define commands in | |
206 .m files without having to mark them as commands. | |
207 | |
208 Note that previous versions of Octave allowed expressions like | |
209 | |
210 x = load -text foo.dat | |
211 | |
212 but an expression like this will now generate a parse error. In | |
213 order to assign the value returned by a function to a variable, | |
214 you must use the normal function call syntax: | |
215 | |
216 x = load ("-text", "foo.dat"); | |
217 | |
8737 | 218 ** Block comments. |
219 | |
8747 | 220 Commented code can be between matching "#{" and "#}" or "%{" and |
221 "%}" markers, even if the commented code spans several line. This | |
222 allows blocks code to be commented, without needing to comment | |
223 each line. For example, | |
5814 | 224 |
8747 | 225 function [s, t] = func (x, y) |
226 s = 2 * x; | |
227 #{ | |
228 s *= y; | |
229 t = y + x; | |
230 #} | |
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231 endfunction |
5814 | 232 |
8747 | 233 the lines "s *= y;" and "t = y + x" will not be executed. |
8737 | 234 |
235 ** Special treatment in the parser of expressions like "a' * b". | |
2452 | 236 |
8737 | 237 In these cases the transpose is no longer explicitly formed and |
238 BLAS libraries are called with the transpose flagged, | |
239 significantly improving performance for these kinds of | |
240 operations. | |
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241 |
8737 | 242 ** Single Precision data type. |
2452 | 243 |
8737 | 244 Octave now includes a single precision data type. Single |
245 precision variables can be created with the "single" command, or | |
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246 from functions like ones, eye, etc. For example, |
5995 | 247 |
8737 | 248 single (1) |
249 ones (2, 2, "single") | |
250 zeros (2, 2, "single") | |
251 eye (2, 2, "single") | |
252 Inf (2, 2, "single") | |
253 NaN (2, 2, "single") | |
254 NA (2, 2, "single") | |
7279 | 255 |
8737 | 256 all create single precision variables. For compatibility with |
257 Matlab, mixed double/single precision operators and functions | |
258 return single precision types. | |
259 | |
260 As a consequence of this addition to Octave the internal | |
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261 representation of the double precision NA value has changed, and |
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262 so users that make use of data generated by Octave with R or |
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263 visa-versa are warned that compatibility might not be assured. |
7279 | 264 |
8737 | 265 ** Improved array indexing. |
266 | |
267 The underlying code used for indexing of arrays has been | |
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268 completely rewritten and indexing is now significantly faster. |
8737 | 269 |
8755 | 270 ** Improved memory management. |
271 | |
272 Octave will now attempt to share data in some cases where previously | |
273 a copy would be made, such as certain array slicing operations or | |
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274 conversions between cells, structs and cs-lists. This usually reduces |
8755 | 275 both time and memory consumption. |
9128 | 276 Also, Octave will now attempt to detect and optimize usage of a vector |
277 as a stack, when elements are being repeatedly inserted at/removed from | |
278 the end of the vector. | |
8755 | 279 |
8738 | 280 ** Improved performance for reduction operations. |
281 | |
8755 | 282 The performance of the sum, prod, sumsq, cumsum, cumprod, any, all, |
283 max and min functions has been significantly improved. | |
8738 | 284 |
9006 | 285 ** Sorting and searching. |
286 | |
287 The performance of sort has been improved, especially when sorting | |
288 indices are requested. An efficient built-in issorted implementation | |
289 was added. sortrows now uses a more efficient algorithm, especially | |
290 in the homegeneous case. lookup is now a built-in function performing | |
291 a binary search, optimized for long runs of close elements. Lookup | |
292 also works with cell arrays of strings. | |
293 | |
294 ** Range arithmetics | |
295 | |
296 For some operations on ranges, Octave will attempt to keep the result as a | |
297 range. These include negation, adding a scalar, subtracting a scalar, and | |
298 multiplying by a scalar. Ranges with zero increment are allowed and can be | |
299 constructed using the built-in function `ones'. | |
300 | |
301 ** Various performance improvements. | |
302 | |
303 Performance of a number of other built-in operations and functions was | |
304 improved, including: | |
305 | |
306 * logical operations | |
307 * comparison operators | |
308 * element-wise power | |
309 * accumarray | |
310 * cellfun | |
311 * isnan | |
312 * isinf | |
313 * isfinite | |
314 * nchoosek | |
315 * repmat | |
316 * strcmp | |
317 | |
8737 | 318 ** 64-bit integer arithmetic. |
319 | |
320 Arithmetic with 64-bit integers (int64 and uint64 types) is fully | |
321 supported, with saturation semantics like the other integer types. | |
322 Performance of most integer arithmetic operations has been | |
323 improved by using integer arithmetic directly. Previously, Octave | |
324 performed integer math with saturation semantics by converting the | |
325 operands to double precision, performing the operation, and then | |
326 converting the result back to an integer value, truncating if | |
327 necessary. | |
328 | |
8885 | 329 ** Diagonal and permutation matrices. |
330 | |
331 The interpreter can now treat diagonal and permutation matrices as | |
332 special objects that store only the non-zero elements, rather than | |
333 general full matrices. Therefore, it is now possible to construct | |
334 and use these matrices in linear algebra without suffering a | |
335 performance penalty due to storing large numbers of zero elements. | |
336 | |
337 ** Improvements to fsolve. | |
338 | |
339 The fsolve function now accepts an option structure argument (see | |
340 also the optimset function). The INFO values returned from fsolve | |
341 have changed to be compatible with Matlab's fsolve function. | |
342 Additionally, fsolve is now able to solve overdetermined systems, | |
343 complex-differentiable complex systems, systems with a sparse | |
344 jacobian and can work in single precision if given single precision | |
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345 inputs. It can also be called recursively. |
8885 | 346 |
8737 | 347 ** Improvements to the norm function. |
348 | |
349 The norm function is now able to compute row or column norms of a | |
350 matrix in a single call, as well as general matrix p-norms. | |
351 | |
352 ** New functions for computing some eigenvalues or singular values. | |
353 | |
354 The eigs and svds functions have been included in Octave. These | |
355 functions require the ARPACK library (now distributed under a | |
356 GPL-compatible license). | |
357 | |
358 ** New QR and Cholesky factorization updating functions. | |
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359 |
8737 | 360 choldelete cholshift qrdelete qrshift |
361 cholinsert cholupdate qrinsert qrupdate | |
362 | |
363 ** New quadrature functions. | |
364 | |
365 dblquad quadgk quadv triplequad | |
366 | |
8885 | 367 ** New functions for reading and writing images. |
368 | |
369 The imwrite and imread functions have been included in Octave. | |
370 These functions require the GraphicsMagick library. The new | |
371 function imfinfo provides information about an image file (size, | |
372 type, colors, etc.) | |
373 | |
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374 ** The input_event_hook function has been replaced by the pair of |
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375 functions add_input_event_hook and remove_input_event_hook so that |
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376 more than one hook function may be installed at a time. |
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377 |
8737 | 378 ** Other miscellaneous new functions. |
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379 |
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380 addtodate hypot reallog |
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381 bicgstab idivide realpow |
9006 | 382 cellslices info realsqrt |
383 cgs interp1q rectint | |
384 command_line_path isdebugmode regexptranslate | |
385 contrast isfloat restoredefaultpath | |
386 convn isstrprop roundb | |
387 cummin log1p rundemos | |
388 cummax lsqnonneg runlength | |
389 datetick matlabroot saveobj | |
390 display namelengthmax spaugment | |
391 expm1 nargoutchk strchr | |
392 filemarker pathdef strvcat | |
393 fstat perl subspace | |
394 full prctile symvar | |
395 fzero quantile treelayout | |
396 genvarname re_read_readline_init_file validatestring | |
397 histc | |
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398 |
8885 | 399 ** Changes to strcat. |
400 | |
401 The strcat function is now compatible with Matlab's strcat | |
402 function, which removes trailing whitespace when concatenating | |
403 character strings. For example | |
404 | |
405 strcat ('foo ', 'bar') | |
406 ==> 'foobar' | |
407 | |
408 The new function cstrcat provides the previous behavior of | |
409 Octave's strcat. | |
410 | |
411 ** Improvements to the help functions. | |
412 | |
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413 The help system has been mostly re-implemented in .m files to make |
8885 | 414 it easier to modify. Performance of the lookfor function has been |
415 greatly improved by caching the help text from all functions that | |
416 are distributed with Octave. The pkg function has been modified | |
417 to generate cache files for external packages when they are | |
418 installed. | |
419 | |
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420 ** Deprecated functions. |
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421 |
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422 The following functions were deprecated in Octave 3.0 and will be |
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423 removed in Octave 3.4 (or whatever version is the second major |
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424 release after 3.0): |
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425 |
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426 beta_cdf geometric_pdf pascal_pdf |
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427 beta_inv geometric_rnd pascal_rnd |
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428 beta_pdf hypergeometric_cdf poisson_cdf |
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429 beta_rnd hypergeometric_inv poisson_inv |
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430 binomial_cdf hypergeometric_pdf poisson_pdf |
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431 binomial_inv hypergeometric_rnd poisson_rnd |
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432 binomial_pdf intersection polyinteg |
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433 binomial_rnd is_bool setstr |
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434 chisquare_cdf is_complex struct_contains |
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435 chisquare_inv is_list struct_elements |
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436 chisquare_pdf is_matrix t_cdf |
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437 chisquare_rnd is_scalar t_inv |
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438 clearplot is_square t_pdf |
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439 clg is_stream t_rnd |
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440 com2str is_struct uniform_cdf |
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441 exponential_cdf is_symmetric uniform_inv |
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442 exponential_inv is_vector uniform_pdf |
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443 exponential_pdf isstr uniform_rnd |
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444 exponential_rnd lognormal_cdf weibcdf |
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445 f_cdf lognormal_inv weibinv |
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446 f_inv lognormal_pdf weibpdf |
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447 f_pdf lognormal_rnd weibrnd |
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448 f_rnd meshdom weibull_cdf |
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449 gamma_cdf normal_cdf weibull_inv |
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450 gamma_inv normal_inv weibull_pdf |
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451 gamma_pdf normal_pdf weibull_rnd |
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452 gamma_rnd normal_rnd wiener_rnd |
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453 geometric_cdf pascal_cdf |
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454 geometric_inv pascal_inv |
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455 |
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456 The following functions are now deprecated in Octave 3.2 and will |
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457 be removed in Octave 3.6 (or whatever version is the second major |
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458 release after 3.2): |
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459 |
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460 create_set spcholinv spmax |
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461 dmult spcumprod spmin |
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462 iscommand spcumsum spprod |
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463 israwcommand spdet spqr |
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464 lchol spdiag spsum |
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465 loadimage spfind spsumsq |
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466 mark_as_command spinv str2mat |
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467 mark_as_rawcommand spkron unmark_command |
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468 spatan2 splchol unmark_rawcommand |
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469 spchol split |
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470 spchol2inv splu |
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471 |
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472 See NEWS.3 for old news. |