test_legendre.cc

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/* Copyright (C) 2003-2008 Oliver Lemke <olemke@core-dump.info>
 
   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; either version 2 of the
   License, or (at your option) any later version.
 
   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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
   USA. */
 
#include "arts.h"
 
#if HAVE_UNISTD_H
# include <sys/types.h>
# include <unistd.h>
#endif
#ifdef _POSIX_VERSION
#include <sys/times.h>
#endif
#include "legendre.h"
#include "exceptions.h"
 
int
main (int argc, char *argv[])
{
  Index l, m;
  Numeric x;
 
  if (argc != 4)
    {
      cerr << "Usage: " << argv[0] << " l m x" << endl;
      exit (1);
    }
 
  l = atoi (argv[1]);
  m = atoi (argv[2]);
  x = strtod (argv[3], NULL);
 
  try
    {
      cout << "l = " << l << "  m = " << m << "  x = " << x << endl;
      cout << "Pml = " << legendre_poly (l, m, x) << endl;
      cout << "dPml = " << legendre_poly_deriv (l, m, x) << endl;
      cout << "Norm Pml = " << legendre_poly_norm_schmidt (l, m, x) << endl;
      cout << "Norm dPml = " << legendre_poly_norm_schmidt_deriv (l, m, x) << endl;
    }
  catch (runtime_error e)
    {
      cerr << e.what ();
    }
 
/*  struct tms cput_start, cput_end;
  const Index n = 1000000;
  Index clktck;
  Vector v2 (n), r2 (n);
 
  cout << endl << "Timing ("
    << n << " loops):" << endl;
 
  for (Index i = 0; i < n; i++)
    {
      v2[i] = -1.0 + Numeric (i) / n * 2.0;
    }
 
  if ((clktck = sysconf (_SC_CLK_TCK)) < 0)
    throw runtime_error ("Timer error: Unable to determine CPU clock ticks");
 
  if (times (&cput_start) == -1)
    throw runtime_error ("Timer error: Unable to get current CPU time");
 
  for (Index i = 0; i < n; i++)
    r2[i] = legendre_poly (l, m, v2[i]);
 
  if (times (&cput_end) == -1)
    throw runtime_error ("Timer error: Unable to get current CPU time");
 
  cout << "CPU time: " << setprecision (2)
    << ((cput_end.tms_stime - cput_start.tms_stime)
        + (cput_end.tms_utime - cput_start.tms_utime))
    / (Numeric)clktck << " s" << endl;
*/
 
  return (0);
}