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comparison scripts/statistics/distributions/geometric_inv.m @ 3426:f8dde1807dee

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[project @ 2000-01-13 08:40:00 by jwe]
author jwe
date Thu, 13 Jan 2000 08:40:53 +0000
parents e4f4b2d26ee9
children 434790acb067
comparison
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3425:8625164a0a39 3426:f8dde1807dee
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: geometric_inv (x, p) 17 ## usage: geometric_inv (x, p)
21 21
22 ## Author: KH <Kurt.Hornik@ci.tuwien.ac.at> 22 ## Author: KH <Kurt.Hornik@ci.tuwien.ac.at>
23 ## Description: Quantile function of the geometric distribution 23 ## Description: Quantile function of the geometric distribution
24 24
25 function inv = geometric_inv (x, p) 25 function inv = geometric_inv (x, p)
26 26
27 if (nargin != 2) 27 if (nargin != 2)
28 usage ("geometric_inv (x, p)"); 28 usage ("geometric_inv (x, p)");
29 endif 29 endif
30 30
31 [retval, x, p] = common_size (x, p); 31 [retval, x, p] = common_size (x, p);
32 if (retval > 0) 32 if (retval > 0)
33 error (["geometric_inv: ", ... 33 error (["geometric_inv: ", ...
34 "x and p must be of common size or scalar"]); 34 "x and p must be of common size or scalar"]);
35 endif 35 endif
36 36
37 [r, c] = size (x); 37 [r, c] = size (x);
38 s = r * c; 38 s = r * c;
39 x = reshape (x, 1, s); 39 x = reshape (x, 1, s);
40 p = reshape (p, 1, s); 40 p = reshape (p, 1, s);
41 inv = zeros (1, s); 41 inv = zeros (1, s);
42 42
43 k = find (!(x >= 0) | !(x <= 1) | !(p >= 0) | !(p <= 1)); 43 k = find (!(x >= 0) | !(x <= 1) | !(p >= 0) | !(p <= 1));
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) & (p >= 0) & (p <= 1)); 48 k = find ((x == 1) & (p >= 0) & (p <= 1));
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) & (p > 0) & (p <= 1)); 53 k = find ((x > 0) & (x < 1) & (p > 0) & (p <= 1));
54 if any (k) 54 if any (k)
55 inv(k) = max (ceil (log (1 - x(k)) ./ log (1 - p(k))) - 1, ... 55 inv(k) = max (ceil (log (1 - x(k)) ./ log (1 - p(k))) - 1, ...
56 zeros (1, length (k))); 56 zeros (1, length (k)));
57 endif 57 endif
58 58
59 inv = reshape (inv, r, c); 59 inv = reshape (inv, r, c);
60 60
61 endfunction 61 endfunction