vbeta.cpp

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/*
 * $Id$
 *
 * Author: David Fournier
 * Copyright (c) 2008-2012 Regents of the University of California
 */
#include <fvar.hpp>

dvariable beta(const prevariable& a,const prevariable& b )
{
  return exp(gammln(a)+gammln(b)-gammln(a+b));
}