1 files changed, 48 insertions, 0 deletions
diff --git a/gsl-1.9/sys/hypot.c b/gsl-1.9/sys/hypot.c
new file mode 100644
index 0000000..631bc10
--- /dev/null
+++ b/gsl-1.9/sys/hypot.c
@@ -0,0 +1,48 @@
+/* sys/hypot.c
+ * 
+ * Copyright (C) 1996, 1997, 1998, 1999, 2000 Gerard Jungman, Brian Gough
+ * 
+ * This program 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 2 of the License, or (at
+ * your option) any later version.
+ * 
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include <config.h>
+#include <math.h>
+
+double gsl_hypot (const double x, const double y);
+
+double gsl_hypot (const double x, const double y)
+{
+  double xabs = fabs(x) ;
+  double yabs = fabs(y) ;
+  double min, max;
+
+  if (xabs < yabs) {
+    min = xabs ;
+    max = yabs ;
+  } else {
+    min = yabs ;
+    max = xabs ;
+  }
+
+  if (min == 0) 
+    {
+      return max ;
+    }
+
+  {
+    double u = min / max ;
+    return max * sqrt (1 + u * u) ;
+  }
+}