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/* $Id: $ */
/* Copyright (C) 1997 Sverre Hvammen Johansen,
* Department of Informatics, University of Oslo.
*
* 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; version 2.
*
* 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 program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "random.h"
#include "trigno.h"
/******************************************************************************
LONG REAL PROCEDURE ERLANG */
double
__rerlang (a, b, U)
double a,
b;
long *U;
{
double sum = 0;
long ci,
bi;
if (a == 0.0)
__rerror ("Erlang: First parameter is equal zero");
if (b <= 0.0)
__rerror ("Erlang: Second parameter is not greater than zero");
bi = (long) b;
if (bi == b)
bi--;
for (ci = 1; ci <= bi; ci++)
sum += log (BASICU);
return (-(sum + (b - (double) (ci - 1)) * log (BASICU)) / (a * b));
}
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