1 files changed, 66 insertions, 0 deletions
diff --git a/gsl-1.9/histogram/add2d.c b/gsl-1.9/histogram/add2d.c
new file mode 100644
index 0000000..066119d
--- /dev/null
+++ b/gsl-1.9/histogram/add2d.c
@@ -0,0 +1,66 @@
+/* histogram/add2d.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 <stdlib.h>
+#include <gsl/gsl_errno.h>
+#include <gsl/gsl_histogram.h>
+#include <gsl/gsl_histogram2d.h>
+
+#include "find2d.c"
+
+int
+gsl_histogram2d_increment (gsl_histogram2d * h, double x, double y)
+{
+  int status = gsl_histogram2d_accumulate (h, x, y, 1.0);
+  return status;
+}
+
+int
+gsl_histogram2d_accumulate (gsl_histogram2d * h,
+                            double x, double y, double weight)
+{
+  const size_t nx = h->nx;
+  const size_t ny = h->ny;
+
+  size_t i = 0, j = 0;
+
+  int status = find2d (h->nx, h->xrange, h->ny, h->yrange, x, y, &i, &j);
+
+  if (status)
+    {
+      return GSL_EDOM;
+    }
+
+  if (i >= nx)
+    {
+      GSL_ERROR ("index lies outside valid range of 0 .. nx - 1",
+                 GSL_ESANITY);
+    }
+
+  if (j >= ny)
+    {
+      GSL_ERROR ("index lies outside valid range of 0 .. ny - 1",
+                 GSL_ESANITY);
+    }
+
+  h->bin[i * ny + j] += weight;
+
+  return GSL_SUCCESS;
+}