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dDiagMatrix.cc
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1996-09-28
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// DiagMatrix manipulations. -*- 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 <iostream.h>
#include <Complex.h>
#include "mx-base.h"
#include "mx-inlines.cc"
#include "lo-error.h"
/*
* Diagonal Matrix class.
*/
#define KLUDGE_DIAG_MATRICES
#define TYPE double
#define KL_DMAT_TYPE DiagMatrix
#include "mx-kludge.cc"
#undef KLUDGE_DIAG_MATRICES
#undef TYPE
#undef KL_DMAT_TYPE
int
DiagMatrix::operator == (const DiagMatrix& a) const
{
if (rows () != a.rows () || cols () != a.cols ())
return 0;
return equal (data (), a.data (), length ());
}
int
DiagMatrix::operator != (const DiagMatrix& a) const
{
return !(*this == a);
}
DiagMatrix&
DiagMatrix::fill (double val)
{
for (int i = 0; i < length (); i++)
elem (i, i) = val;
return *this;
}
DiagMatrix&
DiagMatrix::fill (double val, int beg, int end)
{
if (beg < 0 || end >= length () || end < beg)
{
(*current_liboctave_error_handler) ("range error for fill");
return *this;
}
for (int i = beg; i < end; i++)
elem (i, i) = val;
return *this;
}
DiagMatrix&
DiagMatrix::fill (const ColumnVector& a)
{
int len = length ();
if (a.length () != len)
{
(*current_liboctave_error_handler) ("range error for fill");
return *this;
}
for (int i = 0; i < len; i++)
elem (i, i) = a.elem (i);
return *this;
}
DiagMatrix&
DiagMatrix::fill (const RowVector& a)
{
int len = length ();
if (a.length () != len)
{
(*current_liboctave_error_handler) ("range error for fill");
return *this;
}
for (int i = 0; i < len; i++)
elem (i, i) = a.elem (i);
return *this;
}
DiagMatrix&
DiagMatrix::fill (const ColumnVector& a, int beg)
{
int a_len = a.length ();
if (beg < 0 || beg + a_len >= length ())
{
(*current_liboctave_error_handler) ("range error for fill");
return *this;
}
for (int i = 0; i < a_len; i++)
elem (i+beg, i+beg) = a.elem (i);
return *this;
}
DiagMatrix&
DiagMatrix::fill (const RowVector& a, int beg)
{
int a_len = a.length ();
if (beg < 0 || beg + a_len >= length ())
{
(*current_liboctave_error_handler) ("range error for fill");
return *this;
}
for (int i = 0; i < a_len; i++)
elem (i+beg, i+beg) = a.elem (i);
return *this;
}
DiagMatrix
DiagMatrix::transpose (void) const
{
return DiagMatrix (dup (data (), length ()), cols (), rows ());
}
DiagMatrix
real (const ComplexDiagMatrix& a)
{
DiagMatrix retval;
int a_len = a.length ();
if (a_len > 0)
retval = DiagMatrix (real_dup (a.data (), a_len), a.rows (),
a.cols ());
return retval;
}
DiagMatrix
imag (const ComplexDiagMatrix& a)
{
DiagMatrix retval;
int a_len = a.length ();
if (a_len > 0)
retval = DiagMatrix (imag_dup (a.data (), a_len), a.rows (),
a.cols ());
return retval;
}
Matrix
DiagMatrix::extract (int r1, int c1, int r2, int c2) const
{
if (r1 > r2) { int tmp = r1; r1 = r2; r2 = tmp; }
if (c1 > c2) { int tmp = c1; c1 = c2; c2 = tmp; }
int new_r = r2 - r1 + 1;
int new_c = c2 - c1 + 1;
Matrix result (new_r, new_c);
for (int j = 0; j < new_c; j++)
for (int i = 0; i < new_r; i++)
result.elem (i, j) = elem (r1+i, c1+j);
return result;
}
// extract row or column i.
RowVector
DiagMatrix::row (int i) const
{
int nr = rows ();
int nc = cols ();
if (i < 0 || i >= nr)
{
(*current_liboctave_error_handler) ("invalid row selection");
return RowVector ();
}
RowVector retval (nc, 0.0);
if (nr <= nc || (nr > nc && i < nc))
retval.elem (i) = elem (i, i);
return retval;
}
RowVector
DiagMatrix::row (char *s) const
{
if (! s)
{
(*current_liboctave_error_handler) ("invalid row selection");
return RowVector ();
}
char c = *s;
if (c == 'f' || c == 'F')
return row (0);
else if (c == 'l' || c == 'L')
return row (rows () - 1);
else
{
(*current_liboctave_error_handler) ("invalid row selection");
return RowVector ();
}
}
ColumnVector
DiagMatrix::column (int i) const
{
int nr = rows ();
int nc = cols ();
if (i < 0 || i >= nc)
{
(*current_liboctave_error_handler) ("invalid column selection");
return ColumnVector ();
}
ColumnVector retval (nr, 0.0);
if (nr >= nc || (nr < nc && i < nr))
retval.elem (i) = elem (i, i);
return retval;
}
ColumnVector
DiagMatrix::column (char *s) const
{
if (! s)
{
(*current_liboctave_error_handler) ("invalid column selection");
return ColumnVector ();
}
char c = *s;
if (c == 'f' || c == 'F')
return column (0);
else if (c == 'l' || c == 'L')
return column (cols () - 1);
else
{
(*current_liboctave_error_handler) ("invalid column selection");
return ColumnVector ();
}
}
DiagMatrix
DiagMatrix::inverse (void) const
{
int info;
return inverse (info);
}
DiagMatrix
DiagMatrix::inverse (int &info) const
{
int nr = rows ();
int nc = cols ();
int len = length ();
if (nr != nc)
{
(*current_liboctave_error_handler) ("inverse requires square matrix");
return DiagMatrix ();
}
info = 0;
double *tmp_data = dup (data (), len);
for (int i = 0; i < len; i++)
{
if (elem (i, i) == 0.0)
{
info = -1;
copy (tmp_data, data (), len); // Restore contents.
break;
}
else
{
tmp_data[i] = 1.0 / elem (i, i);
}
}
return DiagMatrix (tmp_data, nr, nc);
}
// diagonal matrix by diagonal matrix -> diagonal matrix operations
DiagMatrix&
DiagMatrix::operator += (const DiagMatrix& a)
{
int nr = rows ();
int nc = cols ();
if (nr != a.rows () || nc != a.cols ())
{
(*current_liboctave_error_handler)
("nonconformant matrix += operation attempted");
return *this;
}
if (nc == 0 || nr == 0)
return *this;
double *d = fortran_vec (); // Ensures only one reference to my privates!
add2 (d, a.data (), length ());
return *this;
}
DiagMatrix&
DiagMatrix::operator -= (const DiagMatrix& a)
{
int nr = rows ();
int nc = cols ();
if (nr != a.rows () || nc != a.cols ())
{
(*current_liboctave_error_handler)
("nonconformant matrix -= operation attempted");
return *this;
}
if (nr == 0 || nc == 0)
return *this;
double *d = fortran_vec (); // Ensures only one reference to my privates!
subtract2 (d, a.data (), length ());
return *this;
}
// diagonal matrix by diagonal matrix -> diagonal matrix operations
DiagMatrix
operator * (const DiagMatrix& a, const DiagMatrix& b)
{
int nr_a = a.rows ();
int nc_a = a.cols ();
int nr_b = b.rows ();
int nc_b = b.cols ();
if (nc_a != nr_b)
{
(*current_liboctave_error_handler)
("nonconformant matrix multiplication attempted");
return DiagMatrix ();
}
if (nr_a == 0 || nc_a == 0 || nc_b == 0)
return DiagMatrix (nr_a, nc_a, 0.0);
DiagMatrix c (nr_a, nc_b);
int len = nr_a < nc_b ? nr_a : nc_b;
for (int i = 0; i < len; i++)
{
double a_element = a.elem (i, i);
double b_element = b.elem (i, i);
if (a_element == 0.0 || b_element == 0.0)
c.elem (i, i) = 0.0;
else if (a_element == 1.0)
c.elem (i, i) = b_element;
else if (b_element == 1.0)
c.elem (i, i) = a_element;
else
c.elem (i, i) = a_element * b_element;
}
return c;
}
// other operations
ColumnVector
DiagMatrix::diag (void) const
{
return diag (0);
}
// Could be optimized...
ColumnVector
DiagMatrix::diag (int k) const
{
int nnr = rows ();
int nnc = cols ();
if (k > 0)
nnc -= k;
else if (k < 0)
nnr += k;
ColumnVector d;
if (nnr > 0 && nnc > 0)
{
int ndiag = (nnr < nnc) ? nnr : nnc;
d.resize (ndiag);
if (k > 0)
{
for (int i = 0; i < ndiag; i++)
d.elem (i) = elem (i, i+k);
}
else if ( k < 0)
{
for (int i = 0; i < ndiag; i++)
d.elem (i) = elem (i-k, i);
}
else
{
for (int i = 0; i < ndiag; i++)
d.elem (i) = elem (i, i);
}
}
else
cerr << "diag: requested diagonal out of range\n";
return d;
}
ostream&
operator << (ostream& os, const DiagMatrix& a)
{
// int field_width = os.precision () + 7;
for (int i = 0; i < a.rows (); i++)
{
for (int j = 0; j < a.cols (); j++)
{
if (i == j)
os << " " /* setw (field_width) */ << a.elem (i, i);
else
os << " " /* setw (field_width) */ << 0.0;
}
os << "\n";
}
return os;
}
/*
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*/