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- // DiagMatrix manipulations.
- /*
-
- Copyright (C) 1996 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
-
- */
-
- #if defined (__GNUG__)
- #pragma implementation
- #endif
-
- #ifdef HAVE_CONFIG_H
- #include <config.h>
- #endif
-
- #include <iostream.h>
-
- #include "lo-error.h"
- #include "mx-base.h"
- #include "mx-inlines.cc"
- #include "oct-cmplx.h"
-
- // Diagonal Matrix class.
-
- bool
- DiagMatrix::operator == (const DiagMatrix& a) const
- {
- if (rows () != a.rows () || cols () != a.cols ())
- return 0;
-
- return equal (data (), a.data (), length ());
- }
-
- bool
- 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 ();
- }
-
- DiagMatrix retval (nr, nc);
-
- info = 0;
- for (int i = 0; i < len; i++)
- {
- if (elem (i, i) == 0.0)
- {
- info = -1;
- return *this;
- }
- else
- retval.elem (i, i) = 1.0 / elem (i, i);
- }
-
- return retval;
- }
-
- // diagonal matrix by diagonal matrix -> diagonal matrix operations
-
- DiagMatrix&
- DiagMatrix::operator += (const DiagMatrix& a)
- {
- int nr = rows ();
- int nc = cols ();
-
- int a_nr = a.rows ();
- int a_nc = a.cols ();
-
- if (nr != a_nr || nc != a_nc)
- {
- gripe_nonconformant ("operator +=", nr, nc, a_nr, a_nc);
- 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 ();
-
- int a_nr = a.rows ();
- int a_nc = a.cols ();
-
- if (nr != a_nr || nc != a_nc)
- {
- gripe_nonconformant ("operator -=", nr, nc, a_nr, a_nc);
- 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)
- {
- gripe_nonconformant ("operaotr *", nr_a, nc_a, nr_b, nc_b);
- 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;
- }
-
- /*
- ;;; Local Variables: ***
- ;;; mode: C++ ***
- ;;; End: ***
- */
-