Mercurial > hg > octave-avbm
annotate scripts/statistics/distributions/exprnd.m @ 9245:16f53d29049f
update copyright notices
| author | John W. Eaton <jwe@octave.org> |
|---|---|
| date | Fri, 22 May 2009 10:46:00 -0400 |
| parents | 1bf0ce0930be |
| children | 3306cfcb856e |
| rev | line source |
|---|---|
| 9245 | 1 ## Copyright (C) 1995, 1996, 1997, 2005, 2006, 2007, 2008, 2009 Kurt Hornik |
| 5410 | 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. | |
| 5410 | 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/>. | |
| 5410 | 18 |
| 19 ## -*- texinfo -*- | |
| 5411 | 20 ## @deftypefn {Function File} {} exprnd (@var{lambda}, @var{r}, @var{c}) |
| 21 ## @deftypefnx {Function File} {} exprnd (@var{lambda}, @var{sz}) | |
| 5410 | 22 ## Return an @var{r} by @var{c} matrix of random samples from the |
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7604
90c9038170bf
doc fix for exp distribution functions
Jaroslav Hajek <highegg@gmail.com>
parents:
7017
diff
changeset
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23 ## exponential distribution with mean @var{lambda}, which must be a |
|
9051
1bf0ce0930be
Grammar check TexInfo in all .m files
Rik <rdrider0-list@yahoo.com>
parents:
8920
diff
changeset
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24 ## scalar or of size @var{r} by @var{c}. Or if @var{sz} is a vector, |
| 5410 | 25 ## create 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 size of @var{lambda}. | |
| 29 ## @end deftypefn | |
| 30 | |
| 5428 | 31 ## Author: KH <Kurt.Hornik@wu-wien.ac.at> |
| 5410 | 32 ## Description: Random deviates from the exponential distribution |
| 33 | |
| 5411 | 34 function rnd = exprnd (l, r, c) |
| 5410 | 35 |
| 36 if (nargin == 3) | |
| 37 if (! (isscalar (r) && (r > 0) && (r == round (r)))) | |
| 5411 | 38 error ("exprnd: r must be a positive integer"); |
| 5410 | 39 endif |
| 40 if (! (isscalar (c) && (c > 0) && (c == round (c)))) | |
| 5411 | 41 error ("exprnd: c must be a positive integer"); |
| 5410 | 42 endif |
| 43 sz = [r, c]; | |
| 44 | |
| 45 if (any (size (l) != 1) && | |
| 6016 | 46 (length (size (l)) != length (sz) || any (size (l) != sz))) |
| 5411 | 47 error ("exprnd: lambda must be scalar or of size [r, c]"); |
| 5410 | 48 endif |
| 49 elseif (nargin == 2) | |
| 50 if (isscalar (r) && (r > 0)) | |
| 51 sz = [r, r]; | |
| 52 elseif (isvector(r) && all (r > 0)) | |
| 53 sz = r(:)'; | |
| 54 else | |
| 7007 | 55 error ("exprnd: r must be a positive integer or vector"); |
| 5410 | 56 endif |
| 57 | |
| 58 if (any (size (l) != 1) && | |
| 59 ((length (size (l)) != length (sz)) || any (size (l) != sz))) | |
| 5411 | 60 error ("exprnd: lambda must be scalar or of size sz"); |
| 5410 | 61 endif |
| 62 elseif (nargin == 1) | |
| 63 sz = size (l); | |
| 64 else | |
| 6046 | 65 print_usage (); |
| 5410 | 66 endif |
| 67 | |
| 68 | |
| 69 if (isscalar (l)) | |
| 70 if ((l > 0) && (l < Inf)) | |
| 6777 | 71 rnd = rande(sz) * l; |
| 5410 | 72 else |
| 73 rnd = NaN * ones (sz); | |
| 74 endif | |
| 75 else | |
| 76 rnd = zeros (sz); | |
| 77 k = find (!(l > 0) | !(l < Inf)); | |
| 78 if (any (k)) | |
| 79 rnd(k) = NaN; | |
| 80 endif | |
| 81 k = find ((l > 0) & (l < Inf)); | |
| 82 if (any (k)) | |
| 6777 | 83 rnd(k) = rande(size(k)) .* l(k); |
| 5410 | 84 endif |
| 85 endif | |
| 86 | |
| 87 endfunction |