1 files changed, 132 insertions, 0 deletions
diff --git a/gsl-1.9/poly/gsl_poly.h b/gsl-1.9/poly/gsl_poly.h
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+++ b/gsl-1.9/poly/gsl_poly.h
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+/* poly/gsl_poly.h
+ * 
+ * Copyright (C) 1996, 1997, 1998, 1999, 2000, 2004 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.
+ */
+
+#ifndef __GSL_POLY_H__
+#define __GSL_POLY_H__
+
+#include <stdlib.h>
+#include <gsl/gsl_complex.h>
+
+#undef __BEGIN_DECLS
+#undef __END_DECLS
+#ifdef __cplusplus
+# define __BEGIN_DECLS extern "C" {
+# define __END_DECLS }
+#else
+# define __BEGIN_DECLS /* empty */
+# define __END_DECLS /* empty */
+#endif
+
+__BEGIN_DECLS
+
+
+/* Evaluate polynomial
+ *
+ * c[0] + c[1] x + c[2] x^2 + ... + c[len-1] x^(len-1)
+ *
+ * exceptions: none
+ */
+double gsl_poly_eval(const double c[], const int len, const double x);
+
+
+#ifdef HAVE_INLINE
+extern inline
+double gsl_poly_eval(const double c[], const int len, const double x)
+{
+  int i;
+  double ans = c[len-1];
+  for(i=len-1; i>0; i--) ans = c[i-1] + x * ans;
+  return ans;
+}
+#endif /* HAVE_INLINE */
+
+/* Work with divided-difference polynomials, Abramowitz & Stegun 25.2.26 */
+
+int
+gsl_poly_dd_init (double dd[], const double x[], const double y[],
+                  size_t size);
+
+double
+gsl_poly_dd_eval (const double dd[], const double xa[], const size_t size, const double x);
+
+#ifdef HAVE_INLINE
+extern inline
+double gsl_poly_dd_eval(const double dd[], const double xa[], const size_t size, const double x)
+{
+  size_t i;
+  double y = dd[size - 1];
+  for (i = size - 1; i--;) y = dd[i] + (x - xa[i]) * y;
+  return y;
+}
+#endif /* HAVE_INLINE */
+
+
+int
+gsl_poly_dd_taylor (double c[], double xp,
+                    const double dd[], const double x[], size_t size,
+                    double w[]);
+
+/* Solve for real or complex roots of the standard quadratic equation,
+ * returning the number of real roots.
+ *
+ * Roots are returned ordered.
+ */
+int gsl_poly_solve_quadratic (double a, double b, double c, 
+                              double * x0, double * x1);
+
+int 
+gsl_poly_complex_solve_quadratic (double a, double b, double c, 
+                                  gsl_complex * z0, gsl_complex * z1);
+
+
+/* Solve for real roots of the cubic equation
+ * x^3 + a x^2 + b x + c = 0, returning the
+ * number of real roots.
+ *
+ * Roots are returned ordered.
+ */
+int gsl_poly_solve_cubic (double a, double b, double c, 
+                          double * x0, double * x1, double * x2);
+
+int 
+gsl_poly_complex_solve_cubic (double a, double b, double c, 
+                              gsl_complex * z0, gsl_complex * z1, 
+                              gsl_complex * z2);
+
+
+/* Solve for the complex roots of a general real polynomial */
+
+typedef struct 
+{ 
+  size_t nc ;
+  double * matrix ; 
+} 
+gsl_poly_complex_workspace ;
+
+gsl_poly_complex_workspace * gsl_poly_complex_workspace_alloc (size_t n);
+void gsl_poly_complex_workspace_free (gsl_poly_complex_workspace * w);
+
+int
+gsl_poly_complex_solve (const double * a, size_t n, 
+                        gsl_poly_complex_workspace * w,
+                        gsl_complex_packed_ptr z);
+
+__END_DECLS
+
+#endif /* __GSL_POLY_H__ */