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- // -*- C++ -*-
- /*
-
- Copyright (C) 1992, 1993, 1994, 1995 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
-
- #include "CmplxSCHUR.h"
- #include "mx-inlines.cc"
- #include "lo-error.h"
- #include "f77-uscore.h"
-
- extern "C"
- {
- int F77_FCN (zgeesx) (const char*, const char*, int (*)(Complex*),
- const char*, const int*, Complex*, const int*,
- int*, Complex*, Complex*, const int*, double*,
- double*, Complex*, const int*, double*, int*,
- int*, long, long);
- }
-
- static int
- complex_select_ana (Complex *a)
- {
- return a->real () < 0.0;
- }
-
- static int
- complex_select_dig (Complex *a)
- {
- return (abs (*a) < 1.0);
- }
-
- int
- ComplexSCHUR::init (const ComplexMatrix& a, const char *ord)
- {
- int a_nr = a.rows ();
- int a_nc = a.cols ();
- if (a_nr != a_nc)
- {
- (*current_liboctave_error_handler)
- ("ComplexSCHUR requires square matrix");
- return -1;
- }
-
- char jobvs = 'V';
- char sort;
- if (*ord == 'A' || *ord == 'D' || *ord == 'a' || *ord == 'd')
- sort = 'S';
- else
- sort = 'N';
-
- char sense = 'N';
-
- int n = a_nc;
- int lwork = 8 * n;
- int info;
- int sdim;
- double rconde;
- double rcondv;
-
- double *rwork = new double [n];
-
- // bwork is not referenced for non-ordered Schur.
-
- int *bwork = 0;
- if (*ord == 'A' || *ord == 'D' || *ord == 'a' || *ord == 'd')
- bwork = new int [n];
-
- Complex *s = dup (a.data (), a.length ());
-
- Complex *work = new Complex [lwork];
- Complex *q = new Complex [n*n];
- Complex *w = new Complex [n];
-
- if (*ord == 'A' || *ord == 'a')
- {
- F77_FCN (zgeesx) (&jobvs, &sort, complex_select_ana, &sense,
- &n, s, &n, &sdim, w, q, &n, &rconde, &rcondv,
- work, &lwork, rwork, bwork, &info, 1L, 1L);
- }
- else if (*ord == 'D' || *ord == 'd')
- {
- F77_FCN (zgeesx) (&jobvs, &sort, complex_select_dig, &sense,
- &n, s, &n, &sdim, w, q, &n, &rconde, &rcondv,
- work, &lwork, rwork, bwork, &info, 1L, 1L);
- }
- else
- {
- F77_FCN (zgeesx) (&jobvs, &sort, (void *) 0, &sense, &n, s,
- &n, &sdim, w, q, &n, &rconde, &rcondv, work,
- &lwork, rwork, bwork, &info, 1L, 1L);
- }
-
- schur_mat = ComplexMatrix (s, n, n);
- unitary_mat = ComplexMatrix (q, n, n);
-
- delete [] w;
- delete [] work;
- delete [] rwork;
- delete [] bwork;
-
- return info;
- }
-
- /*
- ;;; Local Variables: ***
- ;;; mode: C++ ***
- ;;; page-delimiter: "^/\\*" ***
- ;;; End: ***
- */
-