1 files changed, 112 insertions, 0 deletions
diff --git a/gsl-1.9/bspline/test.c b/gsl-1.9/bspline/test.c
new file mode 100644
index 0000000..e05dde0
--- /dev/null
+++ b/gsl-1.9/bspline/test.c
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+/* bspline/test.c
+ * 
+ * Copyright (C) 2006 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_test.h>
+#include <gsl/gsl_errno.h>
+#include <gsl/gsl_bspline.h>
+#include <gsl/gsl_ieee_utils.h>
+
+void
+test_bspline (gsl_bspline_workspace * bw)
+{
+  gsl_vector *B;
+  size_t i, j;
+  size_t n = 100;
+  size_t ncoeffs = gsl_bspline_ncoeffs (bw);
+  size_t order = gsl_bspline_order (bw);
+  size_t nbreak = gsl_bspline_nbreak (bw);
+  double a = gsl_bspline_breakpoint (0, bw);
+  double b = gsl_bspline_breakpoint (nbreak - 1, bw);
+
+  B = gsl_vector_alloc (ncoeffs);
+
+  for (i = 0; i < n; i++)
+    {
+      double xi = a + (b - a) * (i / (n - 1.0));
+      double sum = 0;
+      gsl_bspline_eval (xi, B, bw);
+
+      for (j = 0; j < ncoeffs; j++)
+        {
+          double Bj = gsl_vector_get (B, j);
+          int s = (Bj < 0 || Bj > 1);
+          gsl_test (s,
+                    "basis-spline coefficient %u is in range [0,1] for x=%g",
+                    j, xi);
+          sum += Bj;
+        }
+
+      gsl_test_rel (sum, 1.0, order * GSL_DBL_EPSILON,
+                    "basis-spline order %u is normalized for x=%g", order,
+                    xi);
+    }
+
+  gsl_vector_free (B);
+}
+
+
+
+int
+main (int argc, char **argv)
+{
+  int status = 0;
+  size_t order, breakpoints, i;
+
+  gsl_ieee_env_setup ();
+
+  argc = 0;                     /* prevent warnings about unused parameters */
+  argv = 0;
+
+  for (order = 1; order < 10; order++)
+    {
+      for (breakpoints = 2; breakpoints < 100; breakpoints++)
+        {
+          double a = -1.23 * order, b = 45.6 * order;
+          gsl_bspline_workspace *bw = gsl_bspline_alloc (order, breakpoints);
+          gsl_bspline_knots_uniform (a, b, bw);
+          test_bspline (bw);
+          gsl_bspline_free (bw);
+        }
+    }
+
+
+  for (order = 1; order < 10; order++)
+    {
+      for (breakpoints = 2; breakpoints < 100; breakpoints++)
+        {
+          double a = -1.23 * order, b = 45.6 * order;
+          gsl_bspline_workspace *bw = gsl_bspline_alloc (order, breakpoints);
+          gsl_vector *k = gsl_vector_alloc (breakpoints);
+          for (i = 0; i < breakpoints; i++)
+            {
+              double f, x;
+              f = sqrt (i / (breakpoints - 1.0));
+              x = (1 - f) * a + f * b;
+              gsl_vector_set (k, i, x);
+            };
+          gsl_bspline_knots (k, bw);
+          test_bspline (bw);
+          gsl_vector_free (k);
+          gsl_bspline_free (bw);
+        }
+    }
+
+  exit (gsl_test_summary ());
+}