Mercurial > hg > octave-lyh
annotate scripts/statistics/distributions/laplace_inv.m @ 10525:3306cfcb856e
Replace constructs like "NaN * one()" with "NaN()" and "Inf * ones ()" with "Inf()"
| author | David Bateman <dbateman@free.fr> |
|---|---|
| date | Fri, 16 Apr 2010 10:32:07 +0200 |
| parents | a1dbe9d80eee |
| children | 95c3e38098bf |
| rev | line source |
|---|---|
| 7017 | 1 ## Copyright (C) 1995, 1996, 1997, 1998, 2000, 2002, 2004, 2005, 2006, |
| 2 ## 2007 Kurt Hornik | |
| 3426 | 3 ## |
| 3922 | 4 ## This file is part of Octave. |
| 5 ## | |
| 6 ## Octave is free software; you can redistribute it and/or modify it | |
| 7 ## under the terms of the GNU General Public License as published by | |
| 7016 | 8 ## the Free Software Foundation; either version 3 of the License, or (at |
| 9 ## your option) any later version. | |
| 3426 | 10 ## |
| 3922 | 11 ## Octave is distributed in the hope that it will be useful, but |
| 3191 | 12 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 3426 | 14 ## General Public License for more details. |
| 15 ## | |
| 3191 | 16 ## You should have received a copy of the GNU General Public License |
| 7016 | 17 ## along with Octave; see the file COPYING. If not, see |
| 18 ## <http://www.gnu.org/licenses/>. | |
| 3191 | 19 |
| 3456 | 20 ## -*- texinfo -*- |
| 21 ## @deftypefn {Function File} {} laplace_inv (@var{x}) | |
| 22 ## For each element of @var{x}, compute the quantile (the inverse of the | |
| 23 ## CDF) at @var{x} of the Laplace distribution. | |
| 24 ## @end deftypefn | |
| 3191 | 25 |
| 5428 | 26 ## Author: KH <Kurt.Hornik@wu-wien.ac.at> |
| 3456 | 27 ## Description: Quantile function of the Laplace distribution |
| 3191 | 28 |
| 29 function inv = laplace_inv (x) | |
| 30 | |
| 31 if (nargin != 1) | |
| 6046 | 32 print_usage (); |
| 3191 | 33 endif |
| 34 | |
|
10525
3306cfcb856e
Replace constructs like "NaN * one()" with "NaN()" and "Inf * ones ()" with "Inf()"
David Bateman <dbateman@free.fr>
parents:
7017
diff
changeset
|
35 inv = -Inf (size (x)); |
| 3191 | 36 |
| 37 k = find (isnan (x) | (x < 0) | (x > 1)); | |
| 3456 | 38 if (any (k)) |
| 4859 | 39 inv(k) = NaN; |
| 3191 | 40 endif |
| 3426 | 41 |
| 3191 | 42 k = find (x == 1); |
| 3456 | 43 if (any (k)) |
| 4859 | 44 inv(k) = Inf; |
| 3191 | 45 endif |
| 3426 | 46 |
| 3191 | 47 k = find ((x > 0) & (x < 1)); |
| 3456 | 48 if (any (k)) |
| 49 inv(k) = ((x(k) < 1/2) .* log (2 * x(k)) | |
| 50 - (x(k) > 1/2) .* log (2 * (1 - x(k)))); | |
| 3191 | 51 endif |
| 52 | |
| 4859 | 53 endfunction |