--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/liboctave/fCmplxQRP.cc	Wed May 21 09:36:46 2008 -0400
@@ -0,0 +1,138 @@
+/*
+
+Copyright (C) 1994, 1995, 1996, 1997, 2002, 2003, 2004, 2005, 2007
+              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 3 of the License, 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, see
+<http://www.gnu.org/licenses/>.
+
+*/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <cassert>
+
+#include "fCmplxQRP.h"
+#include "f77-fcn.h"
+#include "lo-error.h"
+
+extern "C"
+{
+  F77_RET_T
+  F77_FUNC (cgeqpf, CGEQPF) (const octave_idx_type&, const octave_idx_type&, FloatComplex*,
+			     const octave_idx_type&, octave_idx_type*, FloatComplex*, FloatComplex*,
+			     float*, octave_idx_type&);
+
+  F77_RET_T
+  F77_FUNC (cungqr, CUNGQR) (const octave_idx_type&, const octave_idx_type&, const octave_idx_type&,
+			     FloatComplex*, const octave_idx_type&, FloatComplex*,
+			     FloatComplex*, const octave_idx_type&, octave_idx_type&);
+}
+
+// It would be best to share some of this code with FloatComplexQR class...
+
+FloatComplexQRP::FloatComplexQRP (const FloatComplexMatrix& a, QR::type qr_type)
+  : FloatComplexQR (), p ()
+{
+  init (a, qr_type);
+}
+
+void
+FloatComplexQRP::init (const FloatComplexMatrix& a, QR::type qr_type)
+{
+  assert (qr_type != QR::raw);
+
+  octave_idx_type m = a.rows ();
+  octave_idx_type n = a.cols ();
+
+  if (m == 0 || n == 0)
+    {
+      (*current_liboctave_error_handler)
+	("FloatComplexQR must have non-empty matrix");
+      return;
+    }
+
+  octave_idx_type min_mn = m < n ? m : n;
+  Array<FloatComplex> tau (min_mn);
+  FloatComplex *ptau = tau.fortran_vec ();
+
+  octave_idx_type lwork = 3*n > 32*m ? 3*n : 32*m;
+  Array<FloatComplex> work (lwork);
+  FloatComplex *pwork = work.fortran_vec ();
+
+  octave_idx_type info = 0;
+
+  FloatComplexMatrix A_fact = a;
+  if (m > n && qr_type != QR::economy)
+    A_fact.resize (m, m, 0.0);
+
+  FloatComplex *tmp_data = A_fact.fortran_vec ();
+
+  Array<float> rwork (2*n);
+  float *prwork = rwork.fortran_vec ();
+
+  Array<octave_idx_type> jpvt (n, 0);
+  octave_idx_type *pjpvt = jpvt.fortran_vec ();
+
+  // Code to enforce a certain permutation could go here...
+
+  F77_XFCN (cgeqpf, CGEQPF, (m, n, tmp_data, m, pjpvt, ptau, pwork,
+			     prwork, info));
+
+  // Form Permutation matrix (if economy is requested, return the
+  // indices only!)
+
+  if (qr_type == QR::economy)
+    {
+      p.resize (1, n, 0.0);
+      for (octave_idx_type j = 0; j < n; j++)
+	p.elem (0, j) = jpvt.elem (j);
+    }
+  else
+    {
+      p.resize (n, n, 0.0);
+      for (octave_idx_type j = 0; j < n; j++)
+	p.elem (jpvt.elem (j) - 1, j) = 1.0;
+    }
+
+  octave_idx_type n2 = (qr_type == QR::economy) ? min_mn : m;
+
+  if (qr_type == QR::economy && m > n)
+    r.resize (n, n, 0.0);
+  else
+    r.resize (m, n, 0.0);
+
+  for (octave_idx_type j = 0; j < n; j++)
+    {
+      octave_idx_type limit = j < min_mn-1 ? j : min_mn-1;
+      for (octave_idx_type i = 0; i <= limit; i++)
+	r.elem (i, j) = A_fact.elem (i, j);
+    }
+
+  F77_XFCN (cungqr, CUNGQR, (m, n2, min_mn, tmp_data, m, ptau,
+			     pwork, lwork, info));
+
+  q = A_fact;
+  q.resize (m, n2);
+}
+
+/*
+;;; Local Variables: ***
+;;; mode: C++ ***
+;;; End: ***
+*/