1 files changed, 70 insertions, 0 deletions
diff --git a/gsl-1.9/integration/qk15.c b/gsl-1.9/integration/qk15.c
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+++ b/gsl-1.9/integration/qk15.c
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+/* integration/qk15.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 <gsl/gsl_integration.h>
+
+/* Gauss quadrature weights and kronrod quadrature abscissae and
+   weights as evaluated with 80 decimal digit arithmetic by
+   L. W. Fullerton, Bell Labs, Nov. 1981. */
+
+static const double xgk[8] =    /* abscissae of the 15-point kronrod rule */
+{
+  0.991455371120812639206854697526329,
+  0.949107912342758524526189684047851,
+  0.864864423359769072789712788640926,
+  0.741531185599394439863864773280788,
+  0.586087235467691130294144838258730,
+  0.405845151377397166906606412076961,
+  0.207784955007898467600689403773245,
+  0.000000000000000000000000000000000
+};
+
+/* xgk[1], xgk[3], ... abscissae of the 7-point gauss rule. 
+   xgk[0], xgk[2], ... abscissae to optimally extend the 7-point gauss rule */
+
+static const double wg[4] =     /* weights of the 7-point gauss rule */
+{
+  0.129484966168869693270611432679082,
+  0.279705391489276667901467771423780,
+  0.381830050505118944950369775488975,
+  0.417959183673469387755102040816327
+};
+
+static const double wgk[8] =    /* weights of the 15-point kronrod rule */
+{
+  0.022935322010529224963732008058970,
+  0.063092092629978553290700663189204,
+  0.104790010322250183839876322541518,
+  0.140653259715525918745189590510238,
+  0.169004726639267902826583426598550,
+  0.190350578064785409913256402421014,
+  0.204432940075298892414161999234649,
+  0.209482141084727828012999174891714
+};
+
+void
+gsl_integration_qk15 (const gsl_function * f, double a, double b,
+      double *result, double *abserr,
+      double *resabs, double *resasc)
+{
+  double fv1[8], fv2[8];
+  gsl_integration_qk (8, xgk, wg, wgk, fv1, fv2, f, a, b, result, abserr, resabs, resasc);
+}
+