1 files changed, 59 insertions, 0 deletions
diff --git a/gsl-1.9/cdf/gumbel2.c b/gsl-1.9/cdf/gumbel2.c
new file mode 100644
index 0000000..62df56b
--- /dev/null
+++ b/gsl-1.9/cdf/gumbel2.c
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+/* cdf/gumbel2.c
+ * 
+ * Copyright (C) 2003 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 <math.h>
+#include <gsl/gsl_math.h>
+#include <gsl/gsl_cdf.h>
+
+double
+gsl_cdf_gumbel2_P (const double x, const double a, const double b)
+{
+  double P;
+
+  if (x == 0)
+    {
+      P = 0;
+    }
+  else
+    {
+      double u = pow (x, a);
+      P = exp (-b / u);
+    }
+
+  return P;
+}
+
+double
+gsl_cdf_gumbel2_Q (const double x, const double a, const double b)
+{
+  double Q;
+
+  if (x == 0)
+    {
+      Q = 1;
+    }
+  else
+    {
+      double u = pow (x, a);
+      Q = -expm1 (-b / u);
+    }
+
+  return Q;
+}