X-Git-Url: https://git.creatis.insa-lyon.fr/pubgit/?p=CreaPhase.git;a=blobdiff_plain;f=octave_packages%2Fstatistics-1.1.3%2Fgamlike.m;fp=octave_packages%2Fstatistics-1.1.3%2Fgamlike.m;h=708589667e0bf484c562cebeedecd03768f08b4c;hp=0000000000000000000000000000000000000000;hb=c880e8788dfc484bf23ce13fa2787f2c6bca4863;hpb=1705066eceaaea976f010f669ce8e972f3734b05

diff --git a/octave_packages/statistics-1.1.3/gamlike.m b/octave_packages/statistics-1.1.3/gamlike.m
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+## Author: Martijn van Oosterhout <kleptog@svana.org>
+## This program is granted to the public domain.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {@var{X} =} gamlike ([@var{A} @var{B}], @var{R})
+## Calculates the negative log-likelihood function for the Gamma
+## distribution over vector @var{R}, with the given parameters @var{A} and @var{B}.
+## @seealso{gampdf, gaminv, gamrnd, gamfit}
+## @end deftypefn
+
+function res = gamlike(P,K)
+
+  if (nargin != 2)
+    print_usage;
+  endif
+
+  a=P(1);
+  b=P(2);
+
+  res = -sum( log( gampdf(K, a, b) ) );
+endfunction