1 files changed, 71 insertions, 0 deletions
diff --git a/glpk-5.0/src/misc/rng1.c b/glpk-5.0/src/misc/rng1.c
new file mode 100644
index 0000000..4184682
--- /dev/null
+++ b/glpk-5.0/src/misc/rng1.c
@@ -0,0 +1,71 @@
+/* rng1.c (pseudo-random number generator) */
+
+/***********************************************************************
+*  This code is part of GLPK (GNU Linear Programming Kit).
+*  Copyright (C) 2003 Free Software Foundation, Inc.
+*  Written by Andrew Makhorin <mao@gnu.org>.
+*
+*  GLPK 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 3 of the License, or
+*  (at your option) any later version.
+*
+*  GLPK 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 GLPK. If not, see <http://www.gnu.org/licenses/>.
+***********************************************************************/
+
+#include "env.h"
+#include "rng.h"
+
+/***********************************************************************
+*  NAME
+*
+*  rng_unif_01 - obtain pseudo-random number in the range [0, 1]
+*
+*  SYNOPSIS
+*
+*  #include "rng.h"
+*  double rng_unif_01(RNG *rand);
+*
+*  RETURNS
+*
+*  The routine rng_unif_01 returns a next pseudo-random number which is
+*  uniformly distributed in the range [0, 1]. */
+
+double rng_unif_01(RNG *rand)
+{     double x;
+      x = (double)rng_next_rand(rand) / 2147483647.0;
+      xassert(0.0 <= x && x <= 1.0);
+      return x;
+}
+
+/***********************************************************************
+*  NAME
+*
+*  rng_uniform - obtain pseudo-random number in the range [a, b]
+*
+*  SYNOPSIS
+*
+*  #include "rng.h"
+*  double rng_uniform(RNG *rand, double a, double b);
+*
+*  RETURNS
+*
+*  The routine rng_uniform returns a next pseudo-random number which is
+*  uniformly distributed in the range [a, b]. */
+
+double rng_uniform(RNG *rand, double a, double b)
+{     double x;
+      xassert(a < b);
+      x = rng_unif_01(rand);
+      x = a * (1.0 - x) + b * x;
+      xassert(a <= x && x <= b);
+      return x;
+}
+
+/* eof */