1 files changed, 33 insertions, 0 deletions
diff --git a/gsl-1.9/multiroots/enorm.c b/gsl-1.9/multiroots/enorm.c
new file mode 100644
index 0000000..4ad40a1
--- /dev/null
+++ b/gsl-1.9/multiroots/enorm.c
@@ -0,0 +1,33 @@
+/* multiroots/enorm.c
+ * 
+ * Copyright (C) 1996, 1997, 1998, 1999, 2000 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.
+ */
+
+static double enorm (const gsl_vector * f);
+
+static double enorm (const gsl_vector * f) {
+  double e2 = 0 ;
+  size_t i, n = f->size ;
+  for (i = 0; i < n ; i++) {
+    double fi= gsl_vector_get(f, i);
+    e2 += fi * fi ;
+  }
+  return sqrt(e2);
+}
+
+
+