--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/quad.cc	Sun Aug 08 01:13:40 1993 +0000
@@ -0,0 +1,187 @@
+// tc-quad.cc                                           -*- C++ -*-
+/*
+
+Copyright (C) 1993 John W. Eaton
+
+This file is part of Octave.
+
+Octave 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, or (at your option) any
+later version.
+
+Octave 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 Octave; see the file COPYING.  If not, write to the Free
+Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#ifdef __GNUG__
+#pragma implementation
+#endif
+
+#include "Quad.h"
+
+#include "tree-const.h"
+#include "variables.h"
+#include "mappers.h"
+#include "gripes.h"
+#include "error.h"
+#include "utils.h"
+
+// Global pointer for user defined function required by quadrature functions.
+static tree *quad_fcn;
+
+#ifdef WITH_DLD
+tree_constant *
+builtin_quad_2 (tree_constant *args, int nargin, int nargout)
+{
+  return do_quad (args, nargin, nargout);
+}
+#endif
+
+double
+quad_user_function (double x)
+{
+  double retval = 0.0;
+
+//  tree_constant name = tree_constant (quad_fcn->name ());
+  tree_constant *args = new tree_constant [2];
+//  args[0] = name;
+  args[1] = tree_constant (x);
+
+  if (quad_fcn != NULL_TREE)
+    {
+      tree_constant *tmp = quad_fcn->eval (args, 2, 1, 0);
+      delete [] args;
+      if (tmp != NULL_TREE_CONST && tmp[0].is_defined ())
+	{
+	  retval = tmp[0].to_scalar ();
+	  delete [] tmp;
+	}
+      else
+	{
+	  delete [] tmp;
+	  gripe_user_supplied_eval ("quad");
+	  jump_to_top_level ();
+	}
+    }
+
+  return retval;
+}
+
+tree_constant *
+do_quad (tree_constant *args, int nargin, int nargout)
+{
+// Assumes that we have been given the correct number of arguments.
+
+  tree_constant *retval = NULL_TREE_CONST;
+
+  quad_fcn = is_valid_function (args[1], "fsolve", 1);
+  if (quad_fcn == NULL_TREE
+      || takes_correct_nargs (quad_fcn, 2, "fsolve", 1) != 1)
+    return retval;
+
+  double a = args[2].to_scalar ();
+  double b = args[3].to_scalar ();
+
+  int indefinite = 0;
+  IndefQuad::IntegralType indef_type = IndefQuad::doubly_infinite;
+  double bound = 0.0;
+  if ((int) xisinf (a) && (int) xisinf (b))
+    {
+      indefinite = 1;
+      indef_type = IndefQuad::doubly_infinite;
+    }
+  else if ((int) xisinf (a))
+    {
+      indefinite = 1;
+      bound = b;
+      indef_type = IndefQuad::neg_inf_to_bound;
+    }
+  else if ((int) xisinf (b))
+    {
+      indefinite = 1;
+      bound = a;
+      indef_type = IndefQuad::bound_to_inf;
+    }
+
+  int ier = 0;
+  int nfun = 0;
+  double abserr = 0.0;
+  double val = 0.0;
+  double abstol = 1e-6;
+  double reltol = 1e-6;
+  Vector tol (2);
+  Vector sing;
+  int have_sing = 0;
+  switch (nargin)
+    {
+    case 6:
+      if (indefinite)
+	{
+	  message ("quad", "sorry, singularities not allowed on infinite intervals");
+	  return retval;
+	}
+      have_sing = 1;
+      sing = args[5].to_vector ();
+    case 5:
+      tol = args[4].to_vector ();
+      switch (tol.capacity ())
+	{
+	case 2:
+	  reltol = tol.elem (1);
+	case 1:
+	  abstol = tol.elem (0);
+	  break;
+	default:
+	  message ("quad", "expecting tol to contain no more than two values");
+	  return retval;
+	}
+    case 4:
+      if (indefinite)
+	{
+	  IndefQuad iq (quad_user_function, bound, indef_type, abstol, reltol);
+	  val = iq.integrate (ier, nfun, abserr);
+	}
+      else
+	{
+	  if (have_sing)
+	    {
+	      DefQuad dq (quad_user_function, a, b, sing, abstol, reltol);
+	      val = dq.integrate (ier, nfun, abserr);
+	    }
+	  else
+	    {
+	      DefQuad dq (quad_user_function, a, b, abstol, reltol);
+	      val = dq.integrate (ier, nfun, abserr);
+	    }
+	}
+      break;
+    default:
+      panic_impossible ();
+      break;
+    }
+
+  retval = new tree_constant [5];
+
+  retval[0] = tree_constant (val);
+  retval[1] = tree_constant ((double) ier);
+  retval[2] = tree_constant ((double) nfun);
+  retval[3] = tree_constant (abserr);
+
+  return retval;
+}
+
+/*
+;;; Local Variables: ***
+;;; mode: C++ ***
+;;; page-delimiter: "^/\\*" ***
+;;; End: ***
+*/
+