home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Geek Gadgets 1
/
ADE-1.bin
/
ade-dist
/
octave-1.1.1p1-src.tgz
/
tar.out
/
fsf
/
octave
/
liboctave
/
EIG.cc
< prev
next >
Wrap
C/C++ Source or Header
|
1996-09-28
|
4KB
|
166 lines
// -*- 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 "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: ***
*/