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Diffstat (limited to 'gsl-1.9/histogram/init2d.c')
-rw-r--r--gsl-1.9/histogram/init2d.c300
1 files changed, 300 insertions, 0 deletions
diff --git a/gsl-1.9/histogram/init2d.c b/gsl-1.9/histogram/init2d.c
new file mode 100644
index 0000000..bed068f
--- /dev/null
+++ b/gsl-1.9/histogram/init2d.c
@@ -0,0 +1,300 @@
+/* histogram/init2d.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 <math.h>
+#include <gsl/gsl_errno.h>
+#include <gsl/gsl_histogram2d.h>
+
+gsl_histogram2d *
+gsl_histogram2d_alloc (const size_t nx, const size_t ny)
+{
+ gsl_histogram2d *h;
+
+ if (nx == 0)
+ {
+ GSL_ERROR_VAL ("histogram2d length nx must be positive integer",
+ GSL_EDOM, 0);
+ }
+
+ if (ny == 0)
+ {
+ GSL_ERROR_VAL ("histogram2d length ny must be positive integer",
+ GSL_EDOM, 0);
+ }
+
+ h = (gsl_histogram2d *) malloc (sizeof (gsl_histogram2d));
+
+ if (h == 0)
+ {
+ GSL_ERROR_VAL ("failed to allocate space for histogram2d struct",
+ GSL_ENOMEM, 0);
+ }
+
+ h->xrange = (double *) malloc ((nx + 1) * sizeof (double));
+
+ if (h->xrange == 0)
+ {
+ free (h); /* exception in constructor, avoid memory leak */
+
+ GSL_ERROR_VAL ("failed to allocate space for histogram2d x ranges",
+ GSL_ENOMEM, 0);
+ }
+
+ h->yrange = (double *) malloc ((ny + 1) * sizeof (double));
+
+ if (h->yrange == 0)
+ {
+ free (h->xrange);
+ free (h); /* exception in constructor, avoid memory leak */
+
+ GSL_ERROR_VAL ("failed to allocate space for histogram2d y ranges",
+ GSL_ENOMEM, 0);
+ }
+
+ h->bin = (double *) malloc (nx * ny * sizeof (double));
+
+ if (h->bin == 0)
+ {
+ free (h->xrange);
+ free (h->yrange);
+ free (h); /* exception in constructor, avoid memory leak */
+
+ GSL_ERROR_VAL ("failed to allocate space for histogram bins",
+ GSL_ENOMEM, 0);
+ }
+
+ h->nx = nx;
+ h->ny = ny;
+
+ 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_histogram2d *
+gsl_histogram2d_calloc_uniform (const size_t nx, const size_t ny,
+ const double xmin, const double xmax,
+ const double ymin, const double ymax)
+{
+ gsl_histogram2d *h;
+
+ if (xmin >= xmax)
+ {
+ GSL_ERROR_VAL ("xmin must be less than xmax", GSL_EINVAL, 0);
+ }
+
+ if (ymin >= ymax)
+ {
+ GSL_ERROR_VAL ("ymin must be less than ymax", GSL_EINVAL, 0);
+ }
+
+ h = gsl_histogram2d_calloc (nx, ny);
+
+ if (h == 0)
+ {
+ return h;
+ }
+
+ make_uniform (h->xrange, nx, xmin, xmax);
+ make_uniform (h->yrange, ny, ymin, ymax);
+
+ return h;
+}
+
+gsl_histogram2d *
+gsl_histogram2d_calloc (const size_t nx, const size_t ny)
+{
+ gsl_histogram2d *h;
+
+ if (nx == 0)
+ {
+ GSL_ERROR_VAL ("histogram2d length nx must be positive integer",
+ GSL_EDOM, 0);
+ }
+
+ if (ny == 0)
+ {
+ GSL_ERROR_VAL ("histogram2d length ny must be positive integer",
+ GSL_EDOM, 0);
+ }
+
+ h = (gsl_histogram2d *) malloc (sizeof (gsl_histogram2d));
+
+ if (h == 0)
+ {
+ GSL_ERROR_VAL ("failed to allocate space for histogram2d struct",
+ GSL_ENOMEM, 0);
+ }
+
+ h->xrange = (double *) malloc ((nx + 1) * sizeof (double));
+
+ if (h->xrange == 0)
+ {
+ free (h); /* exception in constructor, avoid memory leak */
+
+ GSL_ERROR_VAL ("failed to allocate space for histogram2d x ranges",
+ GSL_ENOMEM, 0);
+ }
+
+ h->yrange = (double *) malloc ((ny + 1) * sizeof (double));
+
+ if (h->yrange == 0)
+ {
+ free (h->xrange);
+ free (h); /* exception in constructor, avoid memory leak */
+
+ GSL_ERROR_VAL ("failed to allocate space for histogram2d y ranges",
+ GSL_ENOMEM, 0);
+ }
+
+ h->bin = (double *) malloc (nx * ny * sizeof (double));
+
+ if (h->bin == 0)
+ {
+ free (h->xrange);
+ free (h->yrange);
+ free (h); /* exception in constructor, avoid memory leak */
+
+ GSL_ERROR_VAL ("failed to allocate space for histogram bins",
+ GSL_ENOMEM, 0);
+ }
+
+ {
+ size_t i;
+
+ for (i = 0; i < nx + 1; i++)
+ {
+ h->xrange[i] = i;
+ }
+
+ for (i = 0; i < ny + 1; i++)
+ {
+ h->yrange[i] = i;
+ }
+
+ for (i = 0; i < nx * ny; i++)
+ {
+ h->bin[i] = 0;
+ }
+ }
+
+ h->nx = nx;
+ h->ny = ny;
+
+ return h;
+}
+
+
+void
+gsl_histogram2d_free (gsl_histogram2d * h)
+{
+ free (h->xrange);
+ free (h->yrange);
+ free (h->bin);
+ free (h);
+}
+
+
+int
+gsl_histogram2d_set_ranges_uniform (gsl_histogram2d * h,
+ double xmin, double xmax,
+ double ymin, double ymax)
+{
+ size_t i;
+ const size_t nx = h->nx, ny = h->ny;
+
+ if (xmin >= xmax)
+ {
+ GSL_ERROR_VAL ("xmin must be less than xmax", GSL_EINVAL, 0);
+ }
+
+ if (ymin >= ymax)
+ {
+ GSL_ERROR_VAL ("ymin must be less than ymax", GSL_EINVAL, 0);
+ }
+
+ /* initialize ranges */
+
+ make_uniform (h->xrange, nx, xmin, xmax);
+ make_uniform (h->yrange, ny, ymin, ymax);
+
+ /* clear contents */
+
+ for (i = 0; i < nx * ny; i++)
+ {
+ h->bin[i] = 0;
+ }
+
+ return GSL_SUCCESS;
+}
+
+int
+gsl_histogram2d_set_ranges (gsl_histogram2d * h,
+ const double xrange[], size_t xsize,
+ const double yrange[], size_t ysize)
+{
+ size_t i;
+ const size_t nx = h->nx, ny = h->ny;
+
+ if (xsize != (nx + 1))
+ {
+ GSL_ERROR_VAL ("size of xrange must match size of histogram",
+ GSL_EINVAL, 0);
+ }
+
+ if (ysize != (ny + 1))
+ {
+ GSL_ERROR_VAL ("size of yrange must match size of histogram",
+ GSL_EINVAL, 0);
+ }
+
+ /* initialize ranges */
+
+ for (i = 0; i <= nx; i++)
+ {
+ h->xrange[i] = xrange[i];
+ }
+
+ for (i = 0; i <= ny; i++)
+ {
+ h->yrange[i] = yrange[i];
+ }
+
+ /* clear contents */
+
+ for (i = 0; i < nx * ny; i++)
+ {
+ h->bin[i] = 0;
+ }
+
+ return GSL_SUCCESS;
+}
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