Mercurial > octave-nkf
annotate scripts/statistics/distributions/expcdf.m @ 11523:fd0a3ac60b0e
update copyright notices
| author | John W. Eaton <jwe@octave.org> |
|---|---|
| date | Fri, 14 Jan 2011 05:47:45 -0500 |
| parents | 1740012184f9 |
| 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} {} expcdf (@var{x}, @var{lambda}) |
| 5410 | 21 ## For each element of @var{x}, compute the cumulative distribution |
| 22 ## function (CDF) at @var{x} of the exponential distribution with | |
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23 ## mean @var{lambda}. |
| 5410 | 24 ## |
| 25 ## The arguments can be of common size or scalar. | |
| 26 ## @end deftypefn | |
| 27 | |
| 5428 | 28 ## Author: KH <Kurt.Hornik@wu-wien.ac.at> |
| 5410 | 29 ## Description: CDF of the exponential distribution |
| 30 | |
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31 function cdf = expcdf (x, lambda) |
| 5410 | 32 |
| 33 if (nargin != 2) | |
| 6046 | 34 print_usage (); |
| 5410 | 35 endif |
| 36 | |
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37 if (!isscalar (x) && !isscalar(lambda)) |
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38 [retval, x, lambda] = common_size (x, lambda); |
| 5410 | 39 if (retval > 0) |
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40 error ("expcdf: X and LAMBDA must be of common size or scalar"); |
| 5410 | 41 endif |
| 42 endif | |
| 43 | |
| 44 if (isscalar (x)) | |
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45 sz = size (lambda); |
| 5410 | 46 else |
| 47 sz = size (x); | |
| 48 endif | |
| 49 | |
| 50 cdf = zeros (sz); | |
| 51 | |
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52 k = find (isnan (x) | !(lambda > 0)); |
| 5410 | 53 if (any (k)) |
| 54 cdf(k) = NaN; | |
| 55 endif | |
| 56 | |
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57 k = find ((x == Inf) & (lambda > 0)); |
| 5410 | 58 if (any (k)) |
| 59 cdf(k) = 1; | |
| 60 endif | |
| 61 | |
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62 k = find ((x > 0) & (x < Inf) & (lambda > 0)); |
| 5410 | 63 if (any (k)) |
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64 if isscalar (lambda) |
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65 cdf (k) = 1 - exp (- x(k) ./ lambda); |
| 5410 | 66 elseif isscalar (x) |
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Rik <octave@nomad.inbox5.com>
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67 cdf (k) = 1 - exp (- x ./ lambda(k)); |
| 5410 | 68 else |
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Rik <octave@nomad.inbox5.com>
parents:
8920
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69 cdf (k) = 1 - exp (- x(k) ./ lambda(k)); |
| 5410 | 70 endif |
| 71 endif | |
| 72 | |
| 73 endfunction |