new file mode 100644
--- /dev/null
+++ b/liboctave/DASPK.h
@@ -0,0 +1,168 @@
+/*
+
+Copyright (C) 1996, 1997, 2002 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, 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+
+*/
+
+#if !defined (octave_DASPK_h)
+#define octave_DASPK_h 1
+
+#if defined (__GNUG__)
+#pragma interface
+#endif
+
+#include <cfloat>
+#include <cmath>
+
+#include "DAE.h"
+
+class
+DASPK_options
+{
+public:
+
+  DASPK_options (void) { init (); }
+
+  DASPK_options (const DASPK_options& opt) { copy (opt); }
+
+  DASPK_options& operator = (const DASPK_options& opt)
+    {
+      if (this != &opt)
+	copy (opt);
+
+      return *this;
+    }
+
+  ~DASPK_options (void) { }
+
+  void init (void)
+    {
+      x_absolute_tolerance = DBL_EPSILON * DBL_EPSILON;
+      x_initial_step_size = -1.0;
+      x_maximum_step_size = -1.0;
+      x_minimum_step_size = 0.0;
+      x_relative_tolerance = sqrt (DBL_EPSILON);
+    }
+
+  void copy (const DASPK_options& opt)
+    {
+      x_absolute_tolerance = opt.x_absolute_tolerance;
+      x_initial_step_size = opt.x_initial_step_size;
+      x_maximum_step_size = opt.x_maximum_step_size;
+      x_minimum_step_size = opt.x_minimum_step_size;
+      x_relative_tolerance = opt.x_relative_tolerance;
+    }
+
+  void set_default_options (void) { init (); }
+
+  void set_absolute_tolerance (double val)
+    { x_absolute_tolerance = (val > 0.0) ? val : DBL_EPSILON * DBL_EPSILON; }
+
+  void set_initial_step_size (double val)
+    { x_initial_step_size = (val >= 0.0) ? val : -1.0; }
+
+  void set_maximum_step_size (double val)
+    { x_maximum_step_size = (val >= 0.0) ? val : -1.0; }
+
+  void set_minimum_step_size (double val)
+    { x_minimum_step_size = (val >= 0.0) ? val : 0.0; }
+
+  void set_relative_tolerance (double val)
+    { x_relative_tolerance = (val > 0.0) ? val : ::sqrt (DBL_EPSILON); }
+
+  double absolute_tolerance (void) { return x_absolute_tolerance; }
+
+  double initial_step_size (void) { return x_initial_step_size; }
+
+  double maximum_step_size (void) { return x_maximum_step_size; }
+
+  double minimum_step_size (void) { return x_minimum_step_size; }
+
+  double relative_tolerance (void) { return x_relative_tolerance; }
+
+private:
+
+  double x_absolute_tolerance;
+  double x_initial_step_size;
+  double x_maximum_step_size;
+  double x_minimum_step_size;
+  double x_relative_tolerance;
+};
+
+class
+DASPK : public DAE, public DASPK_options
+{
+public:
+
+  DASPK (void);
+
+  DASPK (const ColumnVector& x, double time, DAEFunc& f);
+
+  DASPK (const ColumnVector& x, const ColumnVector& xdot,
+	 double time, DAEFunc& f);
+
+  ~DASPK (void) { }
+
+  void force_restart (void);
+
+  void set_stop_time (double t);
+  void clear_stop_time (void);
+
+  ColumnVector do_integrate (double t);
+
+  Matrix do_integrate (const ColumnVector& tout);
+
+  Matrix do_integrate (const ColumnVector& tout, const ColumnVector& tcrit); 
+
+  Matrix integrate (const ColumnVector& tout, Matrix& xdot_out);
+
+  Matrix integrate (const ColumnVector& tout, Matrix& xdot_out,
+		    const ColumnVector& tcrit); 
+
+private:
+
+  double stop_time;
+  int stop_time_set;
+
+  int n;
+  int integration_error;
+  int restart;
+  int liw;  
+  int lrw;
+  int idid;
+  int sanity_checked;
+  Array<int> info;
+  Array<int> iwork;
+  Array<double> rwork;
+
+  friend int ddaspk_j (double *time, double *state, double *deriv,
+		       double *pd, double *cj, double *rpar, int *ipar);
+
+  friend int ddaspk_f (double *time, double *state, double *deriv,
+		       double *delta, int *ires, double *rpar, int *ipar);
+
+};
+
+#endif
+
+/*
+;;; Local Variables: ***
+;;; mode: C++ ***
+;;; End: ***
+*/