Mercurial > octave
comparison scripts/statistics/distributions/f_inv.m @ 3426:f8dde1807dee
[project @ 2000-01-13 08:40:00 by jwe]
author | jwe |
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date | Thu, 13 Jan 2000 08:40:53 +0000 |
parents | e4f4b2d26ee9 |
children | 434790acb067 |
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3425:8625164a0a39 | 3426:f8dde1807dee |
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1 ## Copyright (C) 1995, 1996, 1997 Kurt Hornik | 1 ## Copyright (C) 1995, 1996, 1997 Kurt Hornik |
2 ## | 2 ## |
3 ## This program is free software; you can redistribute it and/or modify | 3 ## This program is free software; you can redistribute it and/or modify |
4 ## it under the terms of the GNU General Public License as published by | 4 ## it under the terms of the GNU General Public License as published by |
5 ## the Free Software Foundation; either version 2, or (at your option) | 5 ## the Free Software Foundation; either version 2, or (at your option) |
6 ## any later version. | 6 ## any later version. |
7 ## | 7 ## |
8 ## This program is distributed in the hope that it will be useful, but | 8 ## This program is distributed in the hope that it will be useful, but |
9 ## WITHOUT ANY WARRANTY; without even the implied warranty of | 9 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
10 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | 10 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
11 ## General Public License for more details. | 11 ## General Public License for more details. |
12 ## | 12 ## |
13 ## You should have received a copy of the GNU General Public License | 13 ## You should have received a copy of the GNU General Public License |
14 ## along with this file. If not, write to the Free Software Foundation, | 14 ## along with this file. If not, write to the Free Software Foundation, |
15 ## 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | 15 ## 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
16 | 16 |
17 ## usage: f_inv (x, m, n) | 17 ## usage: f_inv (x, m, n) |
30 | 30 |
31 [retval, x, m, n] = common_size (x, m, n); | 31 [retval, x, m, n] = common_size (x, m, n); |
32 if (retval > 0) | 32 if (retval > 0) |
33 error ("f_inv: x, m and n must be of common size or scalar"); | 33 error ("f_inv: x, m and n must be of common size or scalar"); |
34 endif | 34 endif |
35 | 35 |
36 [r, c] = size (x); | 36 [r, c] = size (x); |
37 s = r * c; | 37 s = r * c; |
38 x = reshape (x, 1, s); | 38 x = reshape (x, 1, s); |
39 m = reshape (m, 1, s); | 39 m = reshape (m, 1, s); |
40 n = reshape (n, 1, s); | 40 n = reshape (n, 1, s); |
42 | 42 |
43 k = find ((x < 0) | (x > 1) | isnan (x) | !(m > 0) | !(n > 0)); | 43 k = find ((x < 0) | (x > 1) | isnan (x) | !(m > 0) | !(n > 0)); |
44 if any (k) | 44 if any (k) |
45 inv(k) = NaN * ones (1, length (k)); | 45 inv(k) = NaN * ones (1, length (k)); |
46 endif | 46 endif |
47 | 47 |
48 k = find ((x == 1) & (m > 0) & (n > 0)); | 48 k = find ((x == 1) & (m > 0) & (n > 0)); |
49 if any (k) | 49 if any (k) |
50 inv(k) = Inf * ones (1, length (k)); | 50 inv(k) = Inf * ones (1, length (k)); |
51 endif | 51 endif |
52 | 52 |
53 k = find ((x > 0) & (x < 1) & (m > 0) & (n > 0)); | 53 k = find ((x > 0) & (x < 1) & (m > 0) & (n > 0)); |
54 if any (k) | 54 if any (k) |
55 inv(k) = (1 ./ beta_inv (1 - x(k), n(k) / 2, m(k) / 2) - 1) ... | 55 inv(k) = (1 ./ beta_inv (1 - x(k), n(k) / 2, m(k) / 2) - 1) ... |
56 .* n(k) ./ m(k); | 56 .* n(k) ./ m(k); |
57 endif | 57 endif |
58 | 58 |
59 ## should we really only allow for positive integer m, n? | 59 ## should we really only allow for positive integer m, n? |
60 k = find ((m != round (m)) | (n != round (n))); | 60 k = find ((m != round (m)) | (n != round (n))); |
61 if any (k) | 61 if any (k) |
62 fprintf (stderr, ... | 62 fprintf (stderr, ... |
63 "WARNING: m and n should be positive integers\n"); | 63 "WARNING: m and n should be positive integers\n"); |
64 inv(k) = NaN * ones (1, length (k)); | 64 inv(k) = NaN * ones (1, length (k)); |
65 endif | 65 endif |
66 | 66 |
67 inv = reshape (inv, r, c); | 67 inv = reshape (inv, r, c); |
68 | 68 |
69 endfunction | 69 endfunction |