1 files changed, 89 insertions, 0 deletions
diff --git a/gsl-1.9/multifit/convergence.c b/gsl-1.9/multifit/convergence.c
new file mode 100644
index 0000000..73a89a3
--- /dev/null
+++ b/gsl-1.9/multifit/convergence.c
@@ -0,0 +1,89 @@
+/* multifit/convergence.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.
+ */
+
+#include <config.h>
+#include <gsl/gsl_math.h>
+#include <gsl/gsl_errno.h>
+#include <gsl/gsl_multifit_nlin.h>
+
+int
+gsl_multifit_test_delta (const gsl_vector * dx, const gsl_vector * x, 
+                         double epsabs, double epsrel)
+{
+  size_t i;
+  int ok = 1;
+  const size_t n = x->size ;
+
+  if (epsrel < 0.0)
+    {
+      GSL_ERROR ("relative tolerance is negative", GSL_EBADTOL);
+    }
+
+  for (i = 0 ; i < n ; i++)
+    {
+      double xi = gsl_vector_get(x,i);
+      double dxi = gsl_vector_get(dx,i);
+      double tolerance = epsabs + epsrel * fabs(xi)  ;
+
+      if (fabs(dxi) < tolerance)
+        {
+          ok = 1;
+        }
+      else
+        {
+          ok = 0;
+          break;
+        }
+    }
+
+  if (ok)
+    return GSL_SUCCESS ;
+
+  return GSL_CONTINUE;
+}
+
+int
+gsl_multifit_test_gradient (const gsl_vector * g, double epsabs)
+{
+  size_t i;
+
+  double residual = 0;
+
+  const size_t n = g->size;
+
+  if (epsabs < 0.0)
+    {
+      GSL_ERROR ("absolute tolerance is negative", GSL_EBADTOL);
+    }
+ 
+  for (i = 0 ; i < n ; i++)
+    {
+      double gi = gsl_vector_get(g, i);
+      
+      residual += fabs(gi);
+    }
+
+
+  if (residual < epsabs)
+    {
+      return GSL_SUCCESS;
+    }
+  
+  return GSL_CONTINUE ;
+}