Mercurial > hg > octave-lyh
annotate scripts/statistics/distributions/unifcdf.m @ 12749:e7cc2d4a6db3 stable
Fix range of sigma in normal distribution to exclude 0.
* normcdf.m, normpdf.m: Correct 's >= 0' to 's > 0'.
| author | Rik <octave@nomad.inbox5.com> |
|---|---|
| date | Thu, 16 Jun 2011 21:05:10 -0700 |
| parents | c792872f8942 |
| children | 19b9f17d22af |
| rev | line source |
|---|---|
| 11523 | 1 ## Copyright (C) 1995-2011 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} {} unifcdf (@var{x}, @var{a}, @var{b}) |
| 5410 | 21 ## Return the CDF at @var{x} of the uniform distribution on [@var{a}, |
|
10793
be55736a0783
Grammarcheck the documentation from m-files.
Rik <octave@nomad.inbox5.com>
parents:
7017
diff
changeset
|
22 ## @var{b}], i.e., PROB (uniform (@var{a}, @var{b}) @leq{} x). |
| 5410 | 23 ## |
| 24 ## Default values are @var{a} = 0, @var{b} = 1. | |
| 25 ## @end deftypefn | |
| 26 | |
| 5428 | 27 ## Author: KH <Kurt.Hornik@wu-wien.ac.at> |
| 5410 | 28 ## Description: CDF of the uniform distribution |
| 29 | |
| 5411 | 30 function cdf = unifcdf (x, a, b) |
| 5410 | 31 |
| 32 if (nargin != 1 && nargin != 3) | |
| 6046 | 33 print_usage (); |
| 5410 | 34 endif |
| 35 | |
| 36 if (nargin == 1) | |
| 37 a = 0; | |
| 38 b = 1; | |
| 39 endif | |
| 40 | |
| 41 if (!isscalar (a) || !isscalar(b)) | |
| 42 [retval, x, a, b] = common_size (x, a, b); | |
| 43 if (retval > 0) | |
|
11472
1740012184f9
Use uppercase for variable names in error() strings to match Info documentation. Only m-files done.
Rik <octave@nomad.inbox5.com>
parents:
10793
diff
changeset
|
44 error ("unifcdf: X, A and B must be of common size or scalar"); |
| 5410 | 45 endif |
| 46 endif | |
| 47 | |
| 48 sz = size (x); | |
| 49 cdf = zeros (sz); | |
| 50 | |
| 51 k = find (isnan (x) | !(a < b)); | |
| 52 if (any (k)) | |
| 53 cdf(k) = NaN; | |
| 54 endif | |
| 55 | |
| 56 k = find ((x >= b) & (a < b)); | |
| 57 if (any (k)) | |
| 58 cdf(k) = 1; | |
| 59 endif | |
|
11587
c792872f8942
all script files: untabify and strip trailing whitespace
John W. Eaton <jwe@octave.org>
parents:
11523
diff
changeset
|
60 |
| 5410 | 61 k = find ((x > a) & (x < b)); |
| 62 if (any (k)) | |
| 63 if (isscalar (a) && isscalar(b)) | |
| 64 cdf(k) = (x(k) < b) .* (x(k) - a) ./ (b - a); | |
| 65 else | |
| 66 cdf(k) = (x(k) < b(k)) .* (x(k) - a(k)) ./ (b(k) - a(k)); | |
| 67 endif | |
| 68 endif | |
| 69 | |
| 70 endfunction |