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Annotation of OpenXM_contrib/gmp/mpfr/tests/tatan.c, Revision 1.1.1.1

1.1       ohara       1: /* Test file for mpfr_arctan.
                      2:
                      3: Copyright 2001, 2002 Free Software Foundation.
                      4: Written by Paul Zimmermann, INRIA Lorraine.
                      5:
                      6: This file is part of the MPFR Library.
                      7:
                      8: The MPFR Library is free software; you can redistribute it and/or modify
                      9: it under the terms of the GNU Lesser General Public License as published by
                     10: the Free Software Foundation; either version 2.1 of the License, or (at your
                     11: option) any later version.
                     12:
                     13: The MPFR Library is distributed in the hope that it will be useful, but
                     14: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
                     15: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
                     16: License for more details.
                     17:
                     18: You should have received a copy of the GNU Lesser General Public License
                     19: along with the MPFR Library; see the file COPYING.LIB.  If not, write to
                     20: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
                     21: MA 02111-1307, USA. */
                     22:
                     23: #include <stdio.h>
                     24: #include <stdlib.h>
                     25: #include "gmp.h"
                     26: #include "mpfr.h"
                     27: #include "mpfr-test.h"
                     28:
                     29: void worst_cases _PROTO((void));
                     30: int mpfr_arctan_aux2 _PROTO((mpfr_ptr, mpfr_srcptr, mp_rnd_t));
                     31:
                     32: void
                     33: worst_cases (void)
                     34: {
                     35:   mpfr_t x, y, z;
                     36:
                     37:   mpfr_init2 (x, 53);
                     38:   mpfr_init2 (y, 53);
                     39:   mpfr_init2 (z, 53);
                     40:
                     41:   mpfr_set_str_raw (x, "1.0000100110000001100111100011001110101110100111011101");
                     42:   mpfr_set_str_raw (y, "1.1001101101110100101100110011011101101000011010111110e-1");
                     43:   mpfr_atan (z, x, GMP_RNDN);
                     44:   if (mpfr_cmp (y, z))
                     45:     {
                     46:       fprintf (stderr, "Error in mpfr_atan for prec=53, rnd=GMP_RNDN\n");
                     47:       fprintf (stderr, "x=");
                     48:       mpfr_out_str (stderr, 2, 0, x, GMP_RNDN);
                     49:       fprintf (stderr, "\nexpected ");
                     50:       mpfr_out_str (stderr, 2, 0, y, GMP_RNDN);
                     51:       fprintf (stderr, "\ngot      ");
                     52:       mpfr_out_str (stderr, 2, 0, z, GMP_RNDN);
                     53:       fprintf (stderr, "\n");
                     54:       exit (1);
                     55:     }
                     56:
                     57:   mpfr_clear (x);
                     58:   mpfr_clear (y);
                     59:   mpfr_clear (z);
                     60: }
                     61:
                     62: int
                     63: main (int argc, char *argv[])
                     64: {
                     65:   unsigned int prec, err, yprec, n, p0 = 2, p1 = 100, N = 10;
                     66:   mp_rnd_t rnd;
                     67:   mpfr_t x, y, z, t;
                     68:
                     69:   worst_cases ();
                     70:
                     71:   mpfr_init (x);
                     72:   mpfr_init (y);
                     73:   mpfr_init (z);
                     74:   mpfr_init (t);
                     75:
                     76:   /* tarctan prec - perform one random computation with precision prec */
                     77:   if (argc >= 2)
                     78:     {
                     79:       p0 = p1 = atoi (argv[1]);
                     80:       N = 1;
                     81:     }
                     82:
                     83:   for (prec = p0; prec <= p1; prec++)
                     84:     {
                     85:       mpfr_set_prec (x, prec);
                     86:       mpfr_set_prec (z, prec);
                     87:       mpfr_set_prec (t, prec);
                     88:       yprec = prec + 10;
                     89:
                     90:       for (n=0; n<N; n++)
                     91:        {
                     92:          mpfr_random (x);
                     93:          rnd = random () % 4;
                     94:          mpfr_set_prec (y, yprec);
                     95:          mpfr_atan (y, x, rnd);
                     96:          err = (rnd == GMP_RNDN) ? yprec + 1 : yprec;
                     97:          if (mpfr_can_round (y, err, rnd, rnd, prec))
                     98:            {
                     99:              mpfr_set (t, y, rnd);
                    100:              mpfr_atan (z, x, rnd);
                    101:              if (mpfr_cmp (t, z))
                    102:                {
                    103:                  printf ("results differ for x=");
                    104:                  mpfr_out_str (stdout, 2, prec, x, GMP_RNDN);
                    105:                  printf (" prec=%u rnd_mode=%s\n", prec,
                    106:                          mpfr_print_rnd_mode (rnd));
                    107:                  printf ("   got ");
                    108:                  mpfr_out_str (stdout, 2, prec, z, GMP_RNDN);
                    109:                  putchar ('\n');
                    110:                  printf ("   expected ");
                    111:                  mpfr_out_str (stdout, 2, prec, t, GMP_RNDN);
                    112:                  putchar ('\n');
                    113:                  printf ("   approximation was ");
                    114:                  mpfr_print_binary (y);
                    115:                  putchar ('\n');
                    116:                  exit (1);
                    117:                }
                    118:            }
                    119:        }
                    120:     }
                    121:
                    122:   mpfr_clear (x);
                    123:   mpfr_clear (y);
                    124:   mpfr_clear (z);
                    125:   mpfr_clear (t);
                    126:
                    127:   return 0;
                    128: }