1 files changed, 198 insertions, 0 deletions
diff --git a/gsl-1.9/histogram/init.c b/gsl-1.9/histogram/init.c
new file mode 100644
index 0000000..6ff47f5
--- /dev/null
+++ b/gsl-1.9/histogram/init.c
@@ -0,0 +1,198 @@
+/* histogram/init.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>
+
+gsl_histogram *
+gsl_histogram_alloc (size_t n)
+{
+  gsl_histogram *h;
+
+  if (n == 0)
+    {
+      GSL_ERROR_VAL ("histogram length n must be positive integer",
+                        GSL_EDOM, 0);
+    }
+
+  h = (gsl_histogram *) malloc (sizeof (gsl_histogram));
+
+  if (h == 0)
+    {
+      GSL_ERROR_VAL ("failed to allocate space for histogram struct",
+                        GSL_ENOMEM, 0);
+    }
+
+  h->range = (double *) malloc ((n + 1) * sizeof (double));
+
+  if (h->range == 0)
+    {
+      free (h);         /* exception in constructor, avoid memory leak */
+
+      GSL_ERROR_VAL ("failed to allocate space for histogram ranges",
+                        GSL_ENOMEM, 0);
+    }
+
+  h->bin = (double *) malloc (n * sizeof (double));
+
+  if (h->bin == 0)
+    {
+      free (h->range);
+      free (h);         /* exception in constructor, avoid memory leak */
+
+      GSL_ERROR_VAL ("failed to allocate space for histogram bins",
+                        GSL_ENOMEM, 0);
+    }
+
+  h->n = n;
+
+  return h;
+}
+
+static void
+make_uniform (double range[], size_t n, double xmin, double xmax)
+{
+  size_t i;
+
+  for (i = 0; i <= n; i++)
+    {
+      double f1 = ((double) (n-i) / (double) n);
+      double f2 = ((double) i / (double) n);
+      range[i] = f1 * xmin +  f2 * xmax;
+    }
+}
+
+gsl_histogram *
+gsl_histogram_calloc_uniform (const size_t n, const double xmin,
+                              const double xmax)
+{
+  gsl_histogram *h;
+
+  if (xmin >= xmax)
+    {
+      GSL_ERROR_VAL ("xmin must be less than xmax", GSL_EINVAL, 0);
+    }
+
+  h = gsl_histogram_calloc (n);
+
+  if (h == 0)
+    {
+      return h;
+    }
+
+  make_uniform (h->range, n, xmin, xmax);
+
+  return h;
+}
+
+gsl_histogram *
+gsl_histogram_calloc (size_t n)
+{
+  gsl_histogram * h = gsl_histogram_alloc (n);
+
+  if (h == 0)
+    {
+      return h;
+    }
+
+  {
+    size_t i;
+
+    for (i = 0; i < n + 1; i++)
+      {
+        h->range[i] = i;
+      }
+
+    for (i = 0; i < n; i++)
+      {
+        h->bin[i] = 0;
+      }
+  }
+
+  h->n = n;
+
+  return h;
+}
+
+
+void
+gsl_histogram_free (gsl_histogram * h)
+{
+  free (h->range);
+  free (h->bin);
+  free (h);
+}
+
+/* These initialization functions suggested by Achim Gaedke */
+
+int 
+gsl_histogram_set_ranges_uniform (gsl_histogram * h, double xmin, double xmax)
+{
+  size_t i;
+  const size_t n = h->n;
+
+  if (xmin >= xmax)
+    {
+      GSL_ERROR ("xmin must be less than xmax", GSL_EINVAL);
+    }
+
+  /* initialize ranges */
+
+  make_uniform (h->range, n, xmin, xmax);
+
+  /* clear contents */
+
+  for (i = 0; i < n; i++)
+    {
+      h->bin[i] = 0;
+    }
+
+  return GSL_SUCCESS;
+}
+
+int 
+gsl_histogram_set_ranges (gsl_histogram * h, const double range[], size_t size)
+{
+  size_t i;
+  const size_t n = h->n;
+
+  if (size != (n+1))
+    {
+      GSL_ERROR ("size of range must match size of histogram", GSL_EINVAL);
+    }
+
+  /* initialize ranges */
+
+  for (i = 0; i <= n; i++)
+    {
+      h->range[i] = range[i];
+    }
+
+  /* clear contents */
+
+  for (i = 0; i < n; i++)
+    {
+      h->bin[i] = 0;
+    }
+
+  return GSL_SUCCESS;
+}
+