1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
|
## Copyright (C) 1995, 1996, 1997 Kurt Hornik
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2, or (at your option)
## any later version.
##
## This program is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this file. If not, write to the Free Software Foundation,
## 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
## usage: laplace_cdf (x)
##
## For each element of x, compute the cumulative distribution function
## (CDF) at x of the Laplace distribution.
## Author: KH <Kurt.Hornik@ci.tuwien.ac.at>
## Description: CDF of the Laplace distribution
function cdf = laplace_cdf (x)
if (nargin != 1)
usage ("laplace_cdf (x)");
endif
[r, c] = size (x);
s = r * c;
x = reshape (x, 1, s);
cdf = zeros (1, s);
k = find (isnan (x));
if any (k)
cdf(k) = NaN * ones (1, length (k));
endif
k = find (x == Inf);
if any (k)
cdf(k) = ones (1, length (k));
endif
k = find ((x > -Inf) & (x < Inf));
if any (k)
cdf(k) = (1 + sign (x(k)) .* (1 - exp (- abs (x(k))))) / 2;
endif
cdf = reshape (cdf, r, c);
endfunction
|
