Mercurial > octave-nkf
annotate scripts/statistics/distributions/poissinv.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} {} poissinv (@var{x}, @var{lambda}) |
| 5410 | 21 ## For each component of @var{x}, compute the quantile (the inverse of |
| 22 ## the CDF) at @var{x} of the Poisson distribution with parameter | |
| 23 ## @var{lambda}. | |
| 24 ## @end deftypefn | |
| 25 | |
| 5428 | 26 ## Author: KH <Kurt.Hornik@wu-wien.ac.at> |
| 5410 | 27 ## Description: Quantile function of the Poisson distribution |
| 28 | |
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Overhaul m-script files to use common variable name between code and documentation.
Rik <octave@nomad.inbox5.com>
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29 function inv = poissinv (x, lambda) |
| 5410 | 30 |
| 31 if (nargin != 2) | |
| 6046 | 32 print_usage (); |
| 5410 | 33 endif |
| 34 | |
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35 if (!isscalar (lambda)) |
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Rik <octave@nomad.inbox5.com>
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36 [retval, x, lambda] = common_size (x, lambda); |
| 5410 | 37 if (retval > 0) |
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38 error ("poissinv: X and LAMBDA must be of common size or scalar"); |
| 5410 | 39 endif |
| 40 endif | |
| 41 | |
| 42 inv = zeros (size (x)); | |
| 43 | |
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Rik <octave@nomad.inbox5.com>
parents:
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44 k = find ((x < 0) | (x > 1) | isnan (x) | !(lambda > 0)); |
| 5410 | 45 if (any (k)) |
| 46 inv(k) = NaN; | |
| 47 endif | |
| 48 | |
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Rik <octave@nomad.inbox5.com>
parents:
10549
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49 k = find ((x == 1) & (lambda > 0)); |
| 5410 | 50 if (any (k)) |
| 51 inv(k) = Inf; | |
| 52 endif | |
| 53 | |
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Rik <octave@nomad.inbox5.com>
parents:
10549
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54 k = find ((x > 0) & (x < 1) & (lambda > 0)); |
| 5410 | 55 if (any (k)) |
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Rik <octave@nomad.inbox5.com>
parents:
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56 if (isscalar (lambda)) |
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57 cdf = exp (-lambda) * ones (size (k)); |
| 5410 | 58 else |
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parents:
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59 cdf = exp (-lambda(k)); |
| 5410 | 60 endif |
| 61 while (1) | |
| 62 m = find (cdf < x(k)); | |
| 63 if (any (m)) | |
| 64 inv(k(m)) = inv(k(m)) + 1; | |
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Rik <octave@nomad.inbox5.com>
parents:
10549
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65 if (isscalar (lambda)) |
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Rik <octave@nomad.inbox5.com>
parents:
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66 cdf(m) = cdf(m) + poisspdf (inv(k(m)), lambda); |
| 10549 | 67 else |
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Overhaul m-script files to use common variable name between code and documentation.
Rik <octave@nomad.inbox5.com>
parents:
10549
diff
changeset
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68 cdf(m) = cdf(m) + poisspdf (inv(k(m)), lambda(k(m))); |
| 10549 | 69 endif |
| 5410 | 70 else |
| 71 break; | |
| 72 endif | |
| 73 endwhile | |
| 74 endif | |
| 75 | |
| 76 endfunction |