Mercurial > octave-nkf
annotate scripts/statistics/distributions/wblrnd.m @ 11094:add5beb3b845
avoid use of | and & in IF conditions in statistics distribution functions
| author | John W. Eaton <jwe@octave.org> |
|---|---|
| date | Sat, 09 Oct 2010 11:55:51 -0400 |
| parents | be55736a0783 |
| children | 9cb5c0b7b43b |
| rev | line source |
|---|---|
| 9245 | 1 ## Copyright (C) 1995, 1996, 1997, 2006, 2007, 2009 Kurt Hornik |
| 5693 | 2 ## |
| 3 ## This file is part of Octave. | |
| 4 ## | |
| 5 ## Octave is free software; you can redistribute it and/or modify it | |
| 6 ## under the terms of the GNU General Public License as published by | |
| 7016 | 7 ## the Free Software Foundation; either version 3 of the License, or (at |
| 8 ## your option) any later version. | |
| 5693 | 9 ## |
| 10 ## Octave is distributed in the hope that it will be useful, but | |
| 11 ## WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 ## General Public License for more details. | |
| 14 ## | |
| 15 ## You should have received a copy of the GNU General Public License | |
| 7016 | 16 ## along with Octave; see the file COPYING. If not, see |
| 17 ## <http://www.gnu.org/licenses/>. | |
| 5693 | 18 |
| 19 ## -*- texinfo -*- | |
|
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20 ## @deftypefn {Function File} {} wblrnd (@var{scale}, @var{shape}, @var{r}, @var{c}) |
| 5693 | 21 ## @deftypefnx {Function File} {} wblrnd (@var{scale}, @var{shape}, @var{sz}) |
| 22 ## Return an @var{r} by @var{c} matrix of random samples from the | |
| 23 ## Weibull distribution with parameters @var{scale} and @var{shape} | |
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24 ## which must be scalar or of size @var{r} by @var{c}. Or if @var{sz} |
| 5693 | 25 ## is a vector return a matrix of size @var{sz}. |
| 26 ## | |
| 27 ## If @var{r} and @var{c} are omitted, the size of the result matrix is | |
| 28 ## the common size of @var{alpha} and @var{sigma}. | |
| 29 ## @end deftypefn | |
| 30 | |
| 31 ## Author: KH <Kurt.Hornik@wu-wien.ac.at> | |
| 32 ## Description: Random deviates from the Weibull distribution | |
| 33 | |
| 34 function rnd = wblrnd (scale, shape, r, c) | |
| 35 | |
| 36 if (nargin > 1) | |
| 37 if (!isscalar(shape) || !isscalar(scale)) | |
| 38 [retval, shape, scale] = common_size (shape, scale); | |
| 39 if (retval > 0) | |
| 10549 | 40 error ("wblrnd: shape and scale must be of common size or scalar"); |
| 5693 | 41 endif |
| 42 endif | |
| 43 endif | |
| 44 | |
| 45 if (nargin == 4) | |
| 46 if (! (isscalar (r) && (r > 0) && (r == round (r)))) | |
| 47 error ("wblrnd: r must be a positive integer"); | |
| 48 endif | |
| 49 if (! (isscalar (c) && (c > 0) && (c == round (c)))) | |
| 50 error ("wblrnd: c must be a positive integer"); | |
| 51 endif | |
| 52 sz = [r, c]; | |
| 53 | |
| 54 if (any (size (scale) != 1) && | |
| 10549 | 55 ((length (size (scale)) != length (sz)) |
| 56 || any (size (scale) != sz))) | |
| 5693 | 57 error ("wblrnd: shape and scale must be scalar or of size [r, c]"); |
| 58 endif | |
| 59 elseif (nargin == 3) | |
| 60 if (isscalar (r) && (r > 0)) | |
| 61 sz = [r, r]; | |
| 62 elseif (isvector(r) && all (r > 0)) | |
| 63 sz = r(:)'; | |
| 64 else | |
| 7007 | 65 error ("wblrnd: r must be a positive integer or vector"); |
| 5693 | 66 endif |
| 67 | |
| 68 if (any (size (scale) != 1) && | |
| 10549 | 69 ((length (size (scale)) != length (sz)) |
| 70 || any (size (scale) != sz))) | |
| 5693 | 71 error ("wblrnd: shape and scale must be scalar or of size sz"); |
| 72 endif | |
| 73 elseif (nargin == 2) | |
| 74 sz = size(shape); | |
| 75 else | |
| 6046 | 76 print_usage (); |
| 5693 | 77 endif |
| 78 | |
| 79 if (isscalar (shape) && isscalar (scale)) | |
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11094
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avoid use of | and & in IF conditions in statistics distribution functions
John W. Eaton <jwe@octave.org>
parents:
10793
diff
changeset
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80 if (shape > 0 && shape < Inf && scale > 0 && scale < Inf) |
| 6350 | 81 rnd = scale .* rande(sz) .^ (1./shape); |
| 5693 | 82 else |
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83 rnd = NaN (sz); |
| 5693 | 84 endif |
| 85 else | |
| 6350 | 86 rnd = scale .* rande(sz) .^ (1./shape); |
| 7017 | 87 k = find ((shape <= 0) | (shape == Inf) | ((scale <= 0) & (scale == Inf))); |
| 6350 | 88 if (any(k)) |
| 89 rnd(k) = NaN; | |
| 5693 | 90 endif |
| 91 endif | |
| 92 | |
| 93 endfunction | |
| 94 |