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authordaney <daney@280ebfd0-de03-0410-8827-d642c229c3f4>2001-10-24 17:23:08 +0000
committerdaney <daney@280ebfd0-de03-0410-8827-d642c229c3f4>2001-10-24 17:23:08 +0000
commitb46d0c113445b8dd1911d759ec85b00dc932b9d6 (patch)
tree0ad7e7b6b322080928782c9483444861417aa8c2
parent763a77a2e82aed293e9e16780a81a7d33f350b9d (diff)
downloadmpfr-b46d0c113445b8dd1911d759ec85b00dc932b9d6.tar.gz
add the function mpfr_dim
git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@1344 280ebfd0-de03-0410-8827-d642c229c3f4
-rw-r--r--dim.c90
1 files changed, 90 insertions, 0 deletions
diff --git a/dim.c b/dim.c
new file mode 100644
index 000000000..ff4ad2e88
--- /dev/null
+++ b/dim.c
@@ -0,0 +1,90 @@
+/* mpfr_dim -- dim of x, y
+
+Copyright (C) 2001 Free Software Foundation.
+
+This file is part of the MPFR Library.
+
+The MPFR Library is free software; you can redistribute it and/or modify
+it under the terms of the GNU Library General Public License as published by
+the Free Software Foundation; either version 2 of the License, or (at your
+option) any later version.
+
+The 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 Library General Public
+License for more details.
+
+You should have received a copy of the GNU Library General Public License
+along with the MPFR 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 "gmp.h"
+#include "gmp-impl.h"
+#include "mpfr.h"
+#include "mpfr-impl.h"
+
+ /* The computation of z=dim(x,y)
+
+ x-y if x > y
+ +0 if x <= y
+ */
+
+int
+#if __STDC__
+mpfr_dim (mpfr_ptr z, mpfr_srcptr x ,mpfr_srcptr y , mp_rnd_t rnd_mode)
+#else
+mpfr_dim (z, x, y, rnd_mode)
+ mpfr_ptr z;
+ mpfr_srcptr x;
+ mpfr_srcptr y;
+ mp_rnd_t rnd_mode;
+#endif
+{
+
+ /****** Declaration ******/
+
+ /* Variable of Intermediary Calculation*/
+ mpfr_t t;
+
+ mp_prec_t Nx; /* Precision of input variable */
+ mp_prec_t Nz; /* Precision of input variable */
+ mp_prec_t Ny; /* Precision of output variable */
+ mp_prec_t Nt;
+
+ int inexact=0;
+
+ if (MPFR_IS_NAN(x) || MPFR_IS_NAN(y) )
+ {
+ MPFR_SET_NAN(z);
+ return 1;
+ }
+ MPFR_CLEAR_NAN(z);
+
+ /* Initialisation of the Precision */
+ Nx=MPFR_PREC(x);
+ Ny=MPFR_PREC(y);
+ Nz=MPFR_PREC(z);
+
+ /* compute the size of intermediary variable */
+ Nt=MAX(Nx,MAX(Ny,Nz));
+
+ /* initialise of intermediary variable */
+ mpfr_init2(t,Nt);
+
+ if(mpfr_cmp(x,y) > 0)
+ mpfr_sub(t,x,y,GMP_RNDN);
+ else
+ {
+ MPFR_SET_ZERO(t);
+ if(MPFR_SIGN(t) < 0)
+ CHANGE_SIGN(t);
+ }
+
+ inexact = mpfr_set(z,t,rnd_mode);
+
+ mpfr_clear(t);
+ return inexact;
+
+}