--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/liboctave/EIG.cc	Mon Jun 06 00:58:18 1994 +0000
@@ -0,0 +1,169 @@
+//                                        -*- C++ -*-
+/*
+
+Copyright (C) 1992, 1993, 1994 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 HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#if defined (__GNUG__)
+#pragma implementation
+#endif
+
+#include "EIG.h"
+#include "mx-inlines.cc"
+#include "lo-error.h"
+#include "f77-uscore.h"
+
+extern "C"
+{
+  int F77_FCN (dgeev) (const char*, const char*, const int*, double*,
+		       const int*, double*, double*, double*,
+		       const int*, double*, const int*, double*,
+		       const int*, int*, long, long);
+
+  int F77_FCN (zgeev) (const char*, const char*, const int*, Complex*,
+		       const int*, Complex*, Complex*, const int*,
+		       Complex*, const int*, Complex*, const int*,
+		       double*, int*, long, long);
+}
+
+int
+EIG::init (const Matrix& a)
+{
+  int a_nr = a.rows ();
+  if (a_nr != a.cols ())
+    {
+      (*current_liboctave_error_handler) ("EIG requires square matrix");
+      return -1;
+    }
+
+  int n = a_nr;
+
+  int info;
+
+  char jobvl = 'N';
+  char jobvr = 'V';
+
+  double *tmp_data = dup (a.data (), a.length ());
+  double *wr = new double[n];
+  double *wi = new double[n];
+  Matrix vr (n, n);
+  double *pvr = vr.fortran_vec ();
+  int lwork = 8*n;
+  double *work = new double[lwork];
+
+  double dummy;
+  int idummy = 1;
+
+  F77_FCN (dgeev) (&jobvl, &jobvr, &n, tmp_data, &n, wr, wi, &dummy,
+		   &idummy, pvr, &n, work, &lwork, &info, 1L, 1L);
+
+  lambda.resize (n);
+  v.resize (n, n);
+
+  for (int j = 0; j < n; j++)
+    {
+      if (wi[j] == 0.0)
+	{
+	  lambda.elem (j) = Complex (wr[j]);
+	  for (int i = 0; i < n; i++)
+	    v.elem (i, j) = vr.elem (i, j);
+	}
+      else
+	{
+	  if (j+1 >= n)
+	    {
+	      (*current_liboctave_error_handler) ("EIG: internal error");
+	      return -1;
+	    }
+
+	  for (int i = 0; i < n; i++)
+	    {
+	      lambda.elem (j) = Complex (wr[j], wi[j]);
+	      lambda.elem (j+1) = Complex (wr[j+1], wi[j+1]);
+	      double real_part = vr.elem (i, j);
+	      double imag_part = vr.elem (i, j+1);
+	      v.elem (i, j) = Complex (real_part, imag_part);
+	      v.elem (i, j+1) = Complex (real_part, -imag_part);
+	    }
+	  j++;
+	}
+    }
+
+  delete [] tmp_data;
+  delete [] wr;
+  delete [] wi;
+  delete [] work;
+
+  return info;
+}
+
+int
+EIG::init (const ComplexMatrix& a)
+{
+  int a_nr = a.rows ();
+  if (a_nr != a.cols ())
+    {
+      (*current_liboctave_error_handler) ("EIG requires square matrix");
+      return -1;
+    }
+
+  int n = a_nr;
+
+  int info;
+
+  char jobvl = 'N';
+  char jobvr = 'V';
+
+  lambda.resize (n);
+  v.resize (n, n);
+
+  Complex *pw = lambda.fortran_vec ();
+  Complex *pvr = v.fortran_vec ();
+
+  Complex *tmp_data = dup (a.data (), a.length ());
+
+  int lwork = 8*n;
+  Complex *work = new Complex[lwork];
+  double *rwork = new double[4*n];
+
+  Complex dummy;
+  int idummy = 1;
+
+  F77_FCN (zgeev) (&jobvl, &jobvr, &n, tmp_data, &n, pw, &dummy,
+		   &idummy, pvr, &n, work, &lwork, rwork, &info, 1L,
+		   1L);
+
+  delete [] tmp_data;
+  delete [] work;
+  delete [] rwork;
+
+  return info;
+}
+
+/*
+;;; Local Variables: ***
+;;; mode: C++ ***
+;;; page-delimiter: "^/\\*" ***
+;;; End: ***
+*/

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/liboctave/EIG.h	Mon Jun 06 00:58:18 1994 +0000
@@ -0,0 +1,124 @@
+//                                  -*- C++ -*-
+/*
+
+Copyright (C) 1992, 1993, 1994 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.
+
+*/
+
+#if !defined (octave_EIG_h)
+#define octave_EIG_h 1
+
+#if defined (__GNUG__)
+#pragma interface
+#endif
+
+class ostream;
+
+#include "dMatrix.h"
+#include "CMatrix.h"
+#include "CColVector.h"
+
+extern "C++" {
+
+class EIG
+{
+friend class Matrix;
+friend class ComplexMatrix;
+
+public:
+
+  EIG (void) {}
+
+  EIG (const Matrix& a);
+  EIG (const Matrix& a, int& info);
+
+  EIG (const ComplexMatrix& a);
+  EIG (const ComplexMatrix& a, int& info);
+
+  EIG (const EIG& a);
+
+  EIG& operator = (const EIG& a);
+
+  ComplexColumnVector eigenvalues (void) const;
+  ComplexMatrix eigenvectors (void) const;
+
+  friend ostream&  operator << (ostream& os, const EIG& a);
+
+private:
+
+  int init (const Matrix& a);
+  int init (const ComplexMatrix& a);
+
+  ComplexColumnVector lambda;
+  ComplexMatrix v;
+};
+
+inline EIG::EIG (const Matrix& a)
+{
+  init (a);
+}
+
+inline EIG::EIG (const Matrix& a, int& info)
+{
+  info = init (a);
+}
+
+inline EIG::EIG (const ComplexMatrix& a)
+{
+  init (a);
+}
+
+inline EIG::EIG (const ComplexMatrix& a, int& info)
+{
+  info = init (a);
+}
+
+inline EIG::EIG (const EIG& a)
+{
+  lambda = a.lambda;
+  v = a.v;
+}
+
+inline EIG& EIG::operator = (const EIG& a)
+{
+  lambda = a.lambda;
+  v = a.v;
+  return *this;
+}
+
+inline ComplexColumnVector EIG::eigenvalues (void) const
+{
+  return lambda;
+}
+
+inline ComplexMatrix EIG::eigenvectors (void) const
+{
+  return v;
+}
+
+} // extern "C++"
+
+#endif
+
+/*
+;;; Local Variables: ***
+;;; mode: C++ ***
+;;; page-delimiter: "^/\\*" ***
+;;; End: ***
+*/