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Diffstat (limited to 'mpfr/tests/tgrandom.c')
-rw-r--r-- | mpfr/tests/tgrandom.c | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/mpfr/tests/tgrandom.c b/mpfr/tests/tgrandom.c new file mode 100644 index 0000000000..ee484cb024 --- /dev/null +++ b/mpfr/tests/tgrandom.c @@ -0,0 +1,140 @@ +/* Test file for mpfr_grandom + +Copyright 2011, 2012, 2013 Free Software Foundation, Inc. +Contributed by the AriC and Caramel projects, INRIA. + +This file is part of the GNU MPFR Library. + +The GNU MPFR Library is free software; you can redistribute it and/or modify +it under the terms of the GNU Lesser General Public License as published by +the Free Software Foundation; either version 3 of the License, or (at your +option) any later version. + +The GNU MPFR Library 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 Lesser General Public +License for more details. + +You should have received a copy of the GNU Lesser General Public License +along with the GNU MPFR Library; see the file COPYING.LESSER. If not, see +http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc., +51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */ + +#include <stdio.h> +#include <stdlib.h> + +#include "mpfr-test.h" + +static void +test_special (mpfr_prec_t p) +{ + mpfr_t x; + int inexact; + + mpfr_init2 (x, p); + + inexact = mpfr_grandom (x, NULL, RANDS, MPFR_RNDN); + if ((inexact & 3) == 0) + { + printf ("Error: mpfr_grandom() returns a zero ternary value.\n"); + exit (1); + } + if ((inexact & (3 << 2)) != 0) + { + printf ("Error: the second ternary value of mpfr_grandom(x, NULL, ...)" + " must be 0.\n"); + exit (1); + } + + mpfr_clear(x); +} + + +static void +test_grandom (long nbtests, mpfr_prec_t prec, mpfr_rnd_t rnd, + int verbose) +{ + mpfr_t *t; + mpfr_t av, va, tmp; + int i, inexact; + + nbtests = (nbtests & 1) ? (nbtests + 1) : nbtests; + t = (mpfr_t *) malloc (nbtests * sizeof (mpfr_t)); + if (t == NULL) + { + fprintf (stderr, "tgrandom: can't allocate memory in test_grandom\n"); + exit (1); + } + + for (i = 0; i < nbtests; ++i) + mpfr_init2 (t[i], prec); + + for (i = 0; i < nbtests; i += 2) + { + inexact = mpfr_grandom (t[i], t[i + 1], RANDS, MPFR_RNDN); + if ((inexact & 3) == 0 || (inexact & (3 << 2)) == 0) + { + /* one call in the loop pretended to return an exact number! */ + printf ("Error: mpfr_grandom() returns a zero ternary value.\n"); + exit (1); + } + } + +#ifdef HAVE_STDARG + if (verbose) + { + mpfr_init2 (av, prec); + mpfr_init2 (va, prec); + mpfr_init2 (tmp, prec); + + mpfr_set_ui (av, 0, MPFR_RNDN); + mpfr_set_ui (va, 0, MPFR_RNDN); + for (i = 0; i < nbtests; ++i) + { + mpfr_add (av, av, t[i], MPFR_RNDN); + mpfr_sqr (tmp, t[i], MPFR_RNDN); + mpfr_add (va, va, tmp, MPFR_RNDN); + } + mpfr_div_ui (av, av, nbtests, MPFR_RNDN); + mpfr_div_ui (va, va, nbtests, MPFR_RNDN); + mpfr_sqr (tmp, av, MPFR_RNDN); + mpfr_sub (va, va, av, MPFR_RNDN); + + mpfr_printf ("Average = %.5Rf\nVariance = %.5Rf\n", av, va); + mpfr_clear (av); + mpfr_clear (va); + mpfr_clear (tmp); + } +#endif /* HAVE_STDARG */ + + for (i = 0; i < nbtests; ++i) + mpfr_clear (t[i]); + free (t); + return; +} + + +int +main (int argc, char *argv[]) +{ + long nbtests; + int verbose; + tests_start_mpfr (); + + verbose = 0; + nbtests = 10; + if (argc > 1) + { + long a = atol (argv[1]); + verbose = 1; + if (a != 0) + nbtests = a; + } + + test_grandom (nbtests, 420, MPFR_RNDN, verbose); + test_special (2); + test_special (42000); + + tests_end_mpfr (); + return 0; +} |