fvar_m12.cpp

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

dvariable trace(const dvar_matrix& M)
{
  dvariable tmp;
  tmp=0.0;
  if (M.colmin()!=M.rowmin() || M.colmax()!=M.rowmax() )
  {
    cerr << " Matrix not square in trace\n";
    ad_exit(1);
  }
  for (int i=M.colmin();i<=M.colmax();i++)
  {
    tmp+=M.elem(i,i);
  }
  return tmp;
}