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annotate NEWS @ 9480:bca39c365fda
update NEWS
author | Jaroslav Hajek <highegg@gmail.com> |
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date | Mon, 03 Aug 2009 15:53:30 +0200 |
parents | 44e2e568f973 |
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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 |
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44 Summary of important user-visible changes for version 3.2: |
5913 | 45 --------------------------------------------------------- |
2452 | 46 |
8737 | 47 ** Compatibility with Matlab graphics has been improved. |
6329 | 48 |
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49 The hggroup object and associated listener callback functions have |
8737 | 50 been added allowing the inclusion of group objects. Data sources |
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51 have been added to these group objects such that |
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52 |
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53 x = 0:0.1:10; |
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54 y = sin (x); |
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55 plot (x, y, "ydatasource", "y"); |
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56 for i = 1 : 100 |
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57 pause(0.1) |
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58 y = sin (x + 0.1 * i); |
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59 refreshdata(); |
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60 endfor |
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61 |
8737 | 62 works as expected. This capability has be used to introduce |
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63 stem-series, bar-series, etc., objects for better Matlab |
8737 | 64 compatibility. |
65 | |
66 ** New graphics functions: | |
67 | |
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68 addlistener ezcontour gcbo refresh |
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69 addproperty ezcontourf ginput refreshdata |
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70 allchild ezmesh gtext specular |
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71 available_backends ezmeshc intwarning surfl |
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72 backend ezplot ishghandle trisurf |
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73 cla ezplot3 isocolors waitforbuttonpress |
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74 clabel ezpolar isonormals |
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75 comet ezsurf isosurface |
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76 dellistener findall linkprop |
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77 diffuse gcbf plotmatrix |
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78 |
8737 | 79 ** New experimental OpenGL/FLTK based plotting system. |
80 | |
81 An experimental plotting system based on OpenGL and the FLTK | |
82 toolkit is now part of Octave. This backend is disabled by | |
83 default. You can switch to using it with the command | |
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84 |
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85 backend ("fltk") |
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86 |
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87 for all future figures or for a particular figure with the command |
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88 |
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89 backend (h, "fltk") |
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90 |
8737 | 91 where "h" is a valid figure handle. Please note that this backend |
92 does not yet support text objects. Obviously, this is a necessary | |
93 feature before it can be considered usable. We are looking for | |
94 volunteers to help implement this missing feature. | |
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95 |
8737 | 96 ** Functions providing direct access to gnuplot have been removed. |
97 | |
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98 The functions __gnuplot_plot__, __gnuplot_set__, __gnuplot_raw__, |
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99 __gnuplot_show__, __gnuplot_replot__, __gnuplot_splot__, |
8737 | 100 __gnuplot_save_data__ and __gnuplot_send_inline_data__ have been |
101 removed from Octave. These function were incompatible with the | |
102 high level graphics handle code. | |
6329 | 103 |
8885 | 104 ** The Control, Finance and Quaternion functions have been removed. |
105 | |
106 These functions are now available as separate packages from | |
107 | |
108 http://octave.sourceforge.net/packages.html | |
109 | |
110 and can be reinstalled using the Octave package manager (see | |
111 the pkg function). | |
112 | |
113 ** Specific sparse matrix functions removed. | |
114 | |
115 The following functions, which handled only sparse matrices have | |
116 been removed. Instead of calling these functions directly, you | |
117 should use the corresponding function without the "sp" prefix. | |
8737 | 118 |
8885 | 119 spatan2 spcumsum spkron spprod |
120 spchol spdet splchol spqr | |
121 spchol2inv spdiag splu spsum | |
122 spcholinv spfind spmax spsumsqk | |
123 spcumprod spinv spmin | |
124 | |
125 ** Improvements to the debugger. | |
126 | |
127 The interactive debugging features have been improved. Stopping | |
128 on statements with dbstop should work correctly now. Stepping | |
129 into and over functions, and stepping one statement at a time | |
130 (with dbstep) now works. Moving up and down the call stack with | |
131 dbup and dbdown now works. The dbstack function is now available | |
132 to print the current function call stack. The new dbquit function | |
133 is available to exit the debugging mode. | |
134 | |
135 ** Improved traceback error messages. | |
136 | |
137 Traceback error messages are much more concise and easier to | |
138 understand. They now display information about the function call | |
139 stack instead of the stack of all statements that were active at | |
140 the point of the error. | |
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141 |
8737 | 142 ** Object Oriented Programming. |
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143 |
8737 | 144 Octave now includes OOP features and the user can create their own |
145 class objects and overloaded functions and operators. For | |
146 example, all methods of a class called "myclass" will be found in | |
147 a directory "@myclass" on the users path. The class specific | |
148 versions of functions and operators take precedence over the | |
149 generic versions of these functions. | |
150 | |
151 New functions related to OOP include | |
7189 | 152 |
8737 | 153 class inferiorto isobject loadobj methods superiorto |
154 | |
155 See the Octave manual for more details. | |
7038 | 156 |
8747 | 157 ** Parsing of Command-style Functions. |
158 | |
159 Octave now parses command-style functions without needing to first | |
160 declare them with "mark_as_command". The rules for recognizing a | |
161 command-style function calls are | |
162 | |
163 * A command must appear as the first word in a statement, | |
164 followed by a space. | |
165 | |
166 * The first character after the space must not be '=' or '(' | |
167 | |
168 * The next token after the space must not look like a binary | |
169 operator. | |
170 | |
171 These rules should be mostly compatible with the way Matlab parses | |
172 command-style function calls and allow users to define commands in | |
173 .m files without having to mark them as commands. | |
174 | |
175 Note that previous versions of Octave allowed expressions like | |
176 | |
177 x = load -text foo.dat | |
178 | |
179 but an expression like this will now generate a parse error. In | |
180 order to assign the value returned by a function to a variable, | |
181 you must use the normal function call syntax: | |
182 | |
183 x = load ("-text", "foo.dat"); | |
184 | |
8737 | 185 ** Block comments. |
186 | |
8747 | 187 Commented code can be between matching "#{" and "#}" or "%{" and |
188 "%}" markers, even if the commented code spans several line. This | |
189 allows blocks code to be commented, without needing to comment | |
190 each line. For example, | |
5814 | 191 |
8747 | 192 function [s, t] = func (x, y) |
193 s = 2 * x; | |
194 #{ | |
195 s *= y; | |
196 t = y + x; | |
197 #} | |
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198 endfunction |
5814 | 199 |
8747 | 200 the lines "s *= y;" and "t = y + x" will not be executed. |
8737 | 201 |
202 ** Special treatment in the parser of expressions like "a' * b". | |
2452 | 203 |
8737 | 204 In these cases the transpose is no longer explicitly formed and |
205 BLAS libraries are called with the transpose flagged, | |
206 significantly improving performance for these kinds of | |
207 operations. | |
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208 |
8737 | 209 ** Single Precision data type. |
2452 | 210 |
8737 | 211 Octave now includes a single precision data type. Single |
212 precision variables can be created with the "single" command, or | |
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213 from functions like ones, eye, etc. For example, |
5995 | 214 |
8737 | 215 single (1) |
216 ones (2, 2, "single") | |
217 zeros (2, 2, "single") | |
218 eye (2, 2, "single") | |
219 Inf (2, 2, "single") | |
220 NaN (2, 2, "single") | |
221 NA (2, 2, "single") | |
7279 | 222 |
8737 | 223 all create single precision variables. For compatibility with |
224 Matlab, mixed double/single precision operators and functions | |
225 return single precision types. | |
226 | |
227 As a consequence of this addition to Octave the internal | |
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228 representation of the double precision NA value has changed, and |
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229 so users that make use of data generated by Octave with R or |
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230 visa-versa are warned that compatibility might not be assured. |
7279 | 231 |
8737 | 232 ** Improved array indexing. |
233 | |
234 The underlying code used for indexing of arrays has been | |
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235 completely rewritten and indexing is now significantly faster. |
8737 | 236 |
8755 | 237 ** Improved memory management. |
238 | |
239 Octave will now attempt to share data in some cases where previously | |
240 a copy would be made, such as certain array slicing operations or | |
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241 conversions between cells, structs and cs-lists. This usually reduces |
8755 | 242 both time and memory consumption. |
9128 | 243 Also, Octave will now attempt to detect and optimize usage of a vector |
244 as a stack, when elements are being repeatedly inserted at/removed from | |
245 the end of the vector. | |
8755 | 246 |
8738 | 247 ** Improved performance for reduction operations. |
248 | |
8755 | 249 The performance of the sum, prod, sumsq, cumsum, cumprod, any, all, |
250 max and min functions has been significantly improved. | |
8738 | 251 |
9006 | 252 ** Sorting and searching. |
253 | |
254 The performance of sort has been improved, especially when sorting | |
255 indices are requested. An efficient built-in issorted implementation | |
256 was added. sortrows now uses a more efficient algorithm, especially | |
257 in the homegeneous case. lookup is now a built-in function performing | |
258 a binary search, optimized for long runs of close elements. Lookup | |
259 also works with cell arrays of strings. | |
260 | |
261 ** Range arithmetics | |
262 | |
263 For some operations on ranges, Octave will attempt to keep the result as a | |
264 range. These include negation, adding a scalar, subtracting a scalar, and | |
265 multiplying by a scalar. Ranges with zero increment are allowed and can be | |
266 constructed using the built-in function `ones'. | |
267 | |
268 ** Various performance improvements. | |
269 | |
270 Performance of a number of other built-in operations and functions was | |
271 improved, including: | |
272 | |
273 * logical operations | |
274 * comparison operators | |
275 * element-wise power | |
276 * accumarray | |
277 * cellfun | |
278 * isnan | |
279 * isinf | |
280 * isfinite | |
281 * nchoosek | |
282 * repmat | |
283 * strcmp | |
284 | |
8737 | 285 ** 64-bit integer arithmetic. |
286 | |
287 Arithmetic with 64-bit integers (int64 and uint64 types) is fully | |
288 supported, with saturation semantics like the other integer types. | |
289 Performance of most integer arithmetic operations has been | |
290 improved by using integer arithmetic directly. Previously, Octave | |
291 performed integer math with saturation semantics by converting the | |
292 operands to double precision, performing the operation, and then | |
293 converting the result back to an integer value, truncating if | |
294 necessary. | |
295 | |
8885 | 296 ** Diagonal and permutation matrices. |
297 | |
298 The interpreter can now treat diagonal and permutation matrices as | |
299 special objects that store only the non-zero elements, rather than | |
300 general full matrices. Therefore, it is now possible to construct | |
301 and use these matrices in linear algebra without suffering a | |
302 performance penalty due to storing large numbers of zero elements. | |
303 | |
304 ** Improvements to fsolve. | |
305 | |
306 The fsolve function now accepts an option structure argument (see | |
307 also the optimset function). The INFO values returned from fsolve | |
308 have changed to be compatible with Matlab's fsolve function. | |
309 Additionally, fsolve is now able to solve overdetermined systems, | |
310 complex-differentiable complex systems, systems with a sparse | |
311 jacobian and can work in single precision if given single precision | |
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312 inputs. It can also be called recursively. |
8885 | 313 |
8737 | 314 ** Improvements to the norm function. |
315 | |
316 The norm function is now able to compute row or column norms of a | |
317 matrix in a single call, as well as general matrix p-norms. | |
318 | |
319 ** New functions for computing some eigenvalues or singular values. | |
320 | |
321 The eigs and svds functions have been included in Octave. These | |
322 functions require the ARPACK library (now distributed under a | |
323 GPL-compatible license). | |
324 | |
325 ** New QR and Cholesky factorization updating functions. | |
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326 |
8737 | 327 choldelete cholshift qrdelete qrshift |
328 cholinsert cholupdate qrinsert qrupdate | |
329 | |
330 ** New quadrature functions. | |
331 | |
332 dblquad quadgk quadv triplequad | |
333 | |
8885 | 334 ** New functions for reading and writing images. |
335 | |
336 The imwrite and imread functions have been included in Octave. | |
337 These functions require the GraphicsMagick library. The new | |
338 function imfinfo provides information about an image file (size, | |
339 type, colors, etc.) | |
340 | |
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341 ** The input_event_hook function has been replaced by the pair of |
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342 functions add_input_event_hook and remove_input_event_hook so that |
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343 more than one hook function may be installed at a time. |
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344 |
8737 | 345 ** Other miscellaneous new functions. |
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346 |
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347 addtodate hypot reallog |
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348 bicgstab idivide realpow |
9006 | 349 cellslices info realsqrt |
350 cgs interp1q rectint | |
351 command_line_path isdebugmode regexptranslate | |
352 contrast isfloat restoredefaultpath | |
353 convn isstrprop roundb | |
354 cummin log1p rundemos | |
355 cummax lsqnonneg runlength | |
356 datetick matlabroot saveobj | |
357 display namelengthmax spaugment | |
358 expm1 nargoutchk strchr | |
359 filemarker pathdef strvcat | |
360 fstat perl subspace | |
361 full prctile symvar | |
362 fzero quantile treelayout | |
363 genvarname re_read_readline_init_file validatestring | |
364 histc | |
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365 |
8885 | 366 ** Changes to strcat. |
367 | |
368 The strcat function is now compatible with Matlab's strcat | |
369 function, which removes trailing whitespace when concatenating | |
370 character strings. For example | |
371 | |
372 strcat ('foo ', 'bar') | |
373 ==> 'foobar' | |
374 | |
375 The new function cstrcat provides the previous behavior of | |
376 Octave's strcat. | |
377 | |
378 ** Improvements to the help functions. | |
379 | |
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Rik <rdrider0-list@yahoo.com>
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380 The help system has been mostly re-implemented in .m files to make |
8885 | 381 it easier to modify. Performance of the lookfor function has been |
382 greatly improved by caching the help text from all functions that | |
383 are distributed with Octave. The pkg function has been modified | |
384 to generate cache files for external packages when they are | |
385 installed. | |
386 | |
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387 ** Deprecated functions. |
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388 |
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389 The following functions were deprecated in Octave 3.0 and will be |
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390 removed in Octave 3.4 (or whatever version is the second major |
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391 release after 3.0): |
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392 |
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393 beta_cdf geometric_pdf pascal_pdf |
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394 beta_inv geometric_rnd pascal_rnd |
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395 beta_pdf hypergeometric_cdf poisson_cdf |
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396 beta_rnd hypergeometric_inv poisson_inv |
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397 binomial_cdf hypergeometric_pdf poisson_pdf |
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398 binomial_inv hypergeometric_rnd poisson_rnd |
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399 binomial_pdf intersection polyinteg |
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400 binomial_rnd is_bool setstr |
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401 chisquare_cdf is_complex struct_contains |
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402 chisquare_inv is_list struct_elements |
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403 chisquare_pdf is_matrix t_cdf |
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404 chisquare_rnd is_scalar t_inv |
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405 clearplot is_square t_pdf |
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406 clg is_stream t_rnd |
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407 com2str is_struct uniform_cdf |
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408 exponential_cdf is_symmetric uniform_inv |
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409 exponential_inv is_vector uniform_pdf |
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410 exponential_pdf isstr uniform_rnd |
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411 exponential_rnd lognormal_cdf weibcdf |
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412 f_cdf lognormal_inv weibinv |
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413 f_inv lognormal_pdf weibpdf |
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414 f_pdf lognormal_rnd weibrnd |
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415 f_rnd meshdom weibull_cdf |
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416 gamma_cdf normal_cdf weibull_inv |
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417 gamma_inv normal_inv weibull_pdf |
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418 gamma_pdf normal_pdf weibull_rnd |
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419 gamma_rnd normal_rnd wiener_rnd |
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420 geometric_cdf pascal_cdf |
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421 geometric_inv pascal_inv |
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422 |
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423 The following functions are now deprecated in Octave 3.2 and will |
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424 be removed in Octave 3.6 (or whatever version is the second major |
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425 release after 3.2): |
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426 |
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427 create_set spcholinv spmax |
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428 dmult spcumprod spmin |
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429 iscommand spcumsum spprod |
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430 israwcommand spdet spqr |
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431 lchol spdiag spsum |
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432 loadimage spfind spsumsq |
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433 mark_as_command spinv str2mat |
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434 mark_as_rawcommand spkron unmark_command |
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435 spatan2 splchol unmark_rawcommand |
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436 spchol split |
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437 spchol2inv splu |
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438 |
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86dae6e5b83c
Initial update of NEWS for 3.2 release
David Bateman <dbateman@free.fr>
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439 See NEWS.3 for old news. |