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dColVector.cc
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1997-03-07
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370 lines
// ColumnVector 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 "f77-fcn.h"
#include "lo-error.h"
#include "mx-base.h"
#include "mx-inlines.cc"
#include "oct-cmplx.h"
// Fortran functions we call.
extern "C"
{
int F77_FCN (dgemv, DGEMV) (const char*, const int&, const int&,
const double&, const double*,
const int&, const double*, const int&,
const double&, double*, const int&,
long);
}
// Column Vector class.
bool
ColumnVector::operator == (const ColumnVector& a) const
{
int len = length ();
if (len != a.length ())
return 0;
return equal (data (), a.data (), len);
}
bool
ColumnVector::operator != (const ColumnVector& a) const
{
return !(*this == a);
}
ColumnVector&
ColumnVector::insert (const ColumnVector& a, int r)
{
int a_len = a.length ();
if (r < 0 || r + a_len > length ())
{
(*current_liboctave_error_handler) ("range error for insert");
return *this;
}
for (int i = 0; i < a_len; i++)
elem (r+i) = a.elem (i);
return *this;
}
ColumnVector&
ColumnVector::fill (double val)
{
int len = length ();
if (len > 0)
for (int i = 0; i < len; i++)
elem (i) = val;
return *this;
}
ColumnVector&
ColumnVector::fill (double val, int r1, int r2)
{
int len = length ();
if (r1 < 0 || r2 < 0 || r1 >= len || r2 >= len)
{
(*current_liboctave_error_handler) ("range error for fill");
return *this;
}
if (r1 > r2) { int tmp = r1; r1 = r2; r2 = tmp; }
for (int i = r1; i <= r2; i++)
elem (i) = val;
return *this;
}
ColumnVector
ColumnVector::stack (const ColumnVector& a) const
{
int len = length ();
int nr_insert = len;
ColumnVector retval (len + a.length ());
retval.insert (*this, 0);
retval.insert (a, nr_insert);
return retval;
}
RowVector
ColumnVector::transpose (void) const
{
return RowVector (*this);
}
ColumnVector
real (const ComplexColumnVector& a)
{
int a_len = a.length ();
ColumnVector retval;
if (a_len > 0)
retval = ColumnVector (real_dup (a.data (), a_len), a_len);
return retval;
}
ColumnVector
imag (const ComplexColumnVector& a)
{
int a_len = a.length ();
ColumnVector retval;
if (a_len > 0)
retval = ColumnVector (imag_dup (a.data (), a_len), a_len);
return retval;
}
// resize is the destructive equivalent for this one
ColumnVector
ColumnVector::extract (int r1, int r2) const
{
if (r1 > r2) { int tmp = r1; r1 = r2; r2 = tmp; }
int new_r = r2 - r1 + 1;
ColumnVector result (new_r);
for (int i = 0; i < new_r; i++)
result.elem (i) = elem (r1+i);
return result;
}
// column vector by column vector -> column vector operations
ColumnVector&
ColumnVector::operator += (const ColumnVector& a)
{
int len = length ();
int a_len = a.length ();
if (len != a_len)
{
gripe_nonconformant ("operator +=", len, a_len);
return *this;
}
if (len == 0)
return *this;
double *d = fortran_vec (); // Ensures only one reference to my privates!
add2 (d, a.data (), len);
return *this;
}
ColumnVector&
ColumnVector::operator -= (const ColumnVector& a)
{
int len = length ();
int a_len = a.length ();
if (len != a_len)
{
gripe_nonconformant ("operator -=", len, a_len);
return *this;
}
if (len == 0)
return *this;
double *d = fortran_vec (); // Ensures only one reference to my privates!
subtract2 (d, a.data (), len);
return *this;
}
// matrix by column vector -> column vector operations
ColumnVector
operator * (const Matrix& m, const ColumnVector& a)
{
ColumnVector retval;
int nr = m.rows ();
int nc = m.cols ();
int a_len = a.length ();
if (nc != a_len)
gripe_nonconformant ("operator *", nr, nc, a_len, 1);
else
{
if (nr == 0 || nc == 0)
retval.resize (nr, 0.0);
else
{
int ld = nr;
retval.resize (nr);
double *y = retval.fortran_vec ();
F77_XFCN (dgemv, DGEMV, ("N", nr, nc, 1.0, m.data (), ld,
a.data (), 1, 0.0, y, 1, 1L));
if (f77_exception_encountered)
(*current_liboctave_error_handler)
("unrecoverable error in dgemv");
}
}
return retval;
}
// diagonal matrix by column vector -> column vector operations
ColumnVector
operator * (const DiagMatrix& m, const ColumnVector& a)
{
ColumnVector retval;
int nr = m.rows ();
int nc = m.cols ();
int a_len = a.length ();
if (nc != a_len)
gripe_nonconformant ("operator *", nr, nc, a_len, 1);
else
{
if (nr == 0 || nc == 0)
retval.resize (nr, 0.0);
else
{
retval.resize (nr);
for (int i = 0; i < a_len; i++)
retval.elem (i) = a.elem (i) * m.elem (i, i);
for (int i = a_len; i < nr; i++)
retval.elem (i) = 0.0;
}
}
return retval;
}
// other operations
ColumnVector
ColumnVector::map (d_d_Mapper f) const
{
ColumnVector b (*this);
return b.apply (f);
}
ColumnVector&
ColumnVector::apply (d_d_Mapper f)
{
double *d = fortran_vec (); // Ensures only one reference to my privates!
for (int i = 0; i < length (); i++)
d[i] = f (d[i]);
return *this;
}
double
ColumnVector::min (void) const
{
int len = length ();
if (len == 0)
return 0.0;
double res = elem (0);
for (int i = 1; i < len; i++)
if (elem (i) < res)
res = elem (i);
return res;
}
double
ColumnVector::max (void) const
{
int len = length ();
if (len == 0)
return 0.0;
double res = elem (0);
for (int i = 1; i < len; i++)
if (elem (i) > res)
res = elem (i);
return res;
}
ostream&
operator << (ostream& os, const ColumnVector& a)
{
// int field_width = os.precision () + 7;
for (int i = 0; i < a.length (); i++)
os << /* setw (field_width) << */ a.elem (i) << "\n";
return os;
}
istream&
operator >> (istream& is, ColumnVector& a)
{
int len = a.length();
if (len < 1)
is.clear (ios::badbit);
else
{
double tmp;
for (int i = 0; i < len; i++)
{
is >> tmp;
if (is)
a.elem (i) = tmp;
else
break;
}
}
return is;
}
/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; End: ***
*/