File reorganisation into three new directories: src, tests and doc.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svnroot/mpc/trunk@82 211d60ee-9f03-0410-a15a-8952a2c7a4e4

1 files changed, 101 insertions, 0 deletions

diff --git a/tests/tcos.c b/tests/tcos.c
new file mode 100644
index 0000000..0ff00fc
--- /dev/null
+++ b/tests/tcos.c
@@ -0,0 +1,101 @@
+/* test file for mpc_cos.
+
+Copyright (C) 2007 INRIA.
+
+This file is part of the MPC Library.
+
+The MPC 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 2.1 of the License, or (at your
+option) any later version.
+
+The MPC 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 MPC Library; see the file COPYING.LIB.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+MA 02111-1307, USA. */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "gmp.h"
+#include "mpfr.h"
+#include "mpc.h"
+
+
+int
+main()
+{
+  mpc_t  x, z, t, u;
+  mpfr_t f, g;
+  mp_prec_t prec;
+
+  mpc_init (x);
+  mpc_init (z);
+  mpc_init (t);
+  mpc_init (u);
+  mpfr_init (g);
+
+  for (prec = 2; prec <= 1000; prec++)
+    {
+      mpc_set_prec (x, prec);
+      mpc_set_prec (z, prec);
+      mpc_set_prec (t, prec);
+      mpc_set_prec (u, 4*prec);
+      mpfr_set_prec (g, prec);
+
+      /* check that cos(I*b) = cosh(b) */
+      mpfr_set_ui (MPC_RE (x), 0, GMP_RNDN);
+      mpfr_random (MPC_IM (x));
+
+      mpc_cos (z, x, MPC_RNDNN);
+      mpfr_cosh (g, MPC_IM(x), GMP_RNDN);
+      if (mpfr_cmp_ui (MPC_IM(z), 0) || mpfr_cmp (g, MPC_RE(z)))
+        {
+          fprintf (stderr, "Error in mpc_cos: cos(I*x) <> cosh(x)\n"
+                   "got      ");
+          mpc_out_str (stderr, 10, 0, z, MPC_RNDNN);
+          fprintf (stderr, "\nexpected ");
+          mpfr_set (MPC_RE (z), g, GMP_RNDN);
+          mpfr_set_ui (MPC_IM (z), 0, GMP_RNDN);
+          mpc_out_str (stderr, 10, 0, z, MPC_RNDNN);
+          fprintf (stderr, "\n");
+          exit (1);
+        }
+    }
+
+
+  /* We also compute the result with four times the precision and check   */
+  /* whether the rounding is correct. Error reports in this part of the   */
+  /* algorithm might still be wrong, though, since there are two          */
+  /* consecutive roundings.                                               */
+  mpc_random (x);
+  mpc_cos (z, x, MPC_RNDNN);
+  mpc_cos (u, x, MPC_RNDNN);
+  mpc_set (t, u, MPC_RNDNN);
+
+  if (mpc_cmp (z, t))
+    {
+      fprintf (stderr, "rounding in cos might be incorrect for\nx=");
+      mpc_out_str (stderr, 2, 0, x, MPC_RNDNN);
+      fprintf (stderr, "\nmpc_cos                     gives ");
+      mpc_out_str (stderr, 2, 0, z, MPC_RNDNN);
+      fprintf (stderr, "\nmpc_cos quadruple precision gives ");
+      mpc_out_str (stderr, 2, 0, u, MPC_RNDNN);
+      fprintf (stderr, "\nand is rounded to                 ");
+      mpc_out_str (stderr, 2, 0, t, MPC_RNDNN);
+      fprintf (stderr, "\n");
+      exit (1);
+    }
+
+  mpc_clear (x);
+  mpc_clear (z);
+  mpc_clear (t);
+  mpc_clear (u);
+  mpfr_clear (g);
+
+  return 0;
+}