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/*
Theseus - maximum likelihood superpositioning of macromolecular structures
Copyright (C) 2004-2015 Douglas L. Theobald
This file is part of THESEUS.
THESEUS 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 3 of
the License, or (at your option) any later version.
THESEUS 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 THESEUS in the file 'COPYING'. If not, see
<http://www.gnu.org/licenses/>.
-/_|:|_|_\-
*/
#include <math.h>
#include <float.h>
#include <stdio.h>
#include <gsl/gsl_sf_gamma.h>
#include <gsl/gsl_math.h>
double
MultivarLnGamma(const int p, const double a)
{
int j;
double mvlng, x;
mvlng = 0.0;
for (j = 1; j <= p; ++j)
{
x = a + (1.0-j)*0.5;
//printf("MVLNGAMMA: %d %d %g %g\n", j, p, a, x); fflush(NULL);
mvlng += gsl_sf_lngamma(x);
}
mvlng += 0.25 * p * (p - 1.0) * log(M_PI);
return(mvlng);
}
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