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dRowVector.cc
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1996-09-28
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391 lines
// RowVector 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"
#include "f77-uscore.h"
// Fortran functions we call.
extern "C"
{
int F77_FCN (dgemv) (const char*, const int*, const int*,
const double*, const double*, const int*,
const double*, const int*, const double*,
double*, const int*, long);
double F77_FCN (ddot) (const int*, const double*, const int*,
const double*, const int*);
}
/*
* Row Vector class.
*/
#define KLUDGE_VECTORS
#define TYPE double
#define KL_VEC_TYPE RowVector
#include "mx-kludge.cc"
#undef KLUDGE_VECTORS
#undef TYPE
#undef KL_VEC_TYPE
int
RowVector::operator == (const RowVector& a) const
{
int len = length ();
if (len != a.length ())
return 0;
return equal (data (), a.data (), len);
}
int
RowVector::operator != (const RowVector& a) const
{
return !(*this == a);
}
RowVector&
RowVector::insert (const RowVector& a, int c)
{
int a_len = a.length ();
if (c < 0 || c + a_len - 1 > length ())
{
(*current_liboctave_error_handler) ("range error for insert");
return *this;
}
for (int i = 0; i < a_len; i++)
elem (c+i) = a.elem (i);
return *this;
}
RowVector&
RowVector::fill (double val)
{
int len = length ();
if (len > 0)
for (int i = 0; i < len; i++)
elem (i) = val;
return *this;
}
RowVector&
RowVector::fill (double val, int c1, int c2)
{
int len = length ();
if (c1 < 0 || c2 < 0 || c1 >= len || c2 >= len)
{
(*current_liboctave_error_handler) ("range error for fill");
return *this;
}
if (c1 > c2) { int tmp = c1; c1 = c2; c2 = tmp; }
for (int i = c1; i <= c2; i++)
elem (i) = val;
return *this;
}
RowVector
RowVector::append (const RowVector& a) const
{
int len = length ();
int nc_insert = len;
RowVector retval (len + a.length ());
retval.insert (*this, 0);
retval.insert (a, nc_insert);
return retval;
}
ColumnVector
RowVector::transpose (void) const
{
int len = length ();
return ColumnVector (dup (data (), len), len);
}
RowVector
real (const ComplexRowVector& a)
{
int a_len = a.length ();
RowVector retval;
if (a_len > 0)
retval = RowVector (real_dup (a.data (), a_len), a_len);
return retval;
}
RowVector
imag (const ComplexRowVector& a)
{
int a_len = a.length ();
RowVector retval;
if (a_len > 0)
retval = RowVector (imag_dup (a.data (), a_len), a_len);
return retval;
}
RowVector
RowVector::extract (int c1, int c2) const
{
if (c1 > c2) { int tmp = c1; c1 = c2; c2 = tmp; }
int new_c = c2 - c1 + 1;
RowVector result (new_c);
for (int i = 0; i < new_c; i++)
result.elem (i) = elem (c1+i);
return result;
}
// row vector by row vector -> row vector operations
RowVector&
RowVector::operator += (const RowVector& a)
{
int len = length ();
if (len != a.length ())
{
(*current_liboctave_error_handler)
("nonconformant vector += operation attempted");
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;
}
RowVector&
RowVector::operator -= (const RowVector& a)
{
int len = length ();
if (len != a.length ())
{
(*current_liboctave_error_handler)
("nonconformant vector -= operation attempted");
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;
}
// row vector by matrix -> row vector
RowVector
operator * (const RowVector& v, const Matrix& a)
{
int len = v.length ();
if (a.rows () != len)
{
(*current_liboctave_error_handler)
("nonconformant vector multiplication attempted");
return RowVector ();
}
if (len == 0 || a.cols () == 0)
return RowVector (0);
// Transpose A to form A'*x == (x'*A)'
int a_nr = a.rows ();
int a_nc = a.cols ();
char trans = 'T';
int ld = a_nr;
double alpha = 1.0;
double beta = 0.0;
int i_one = 1;
double *y = new double [len];
F77_FCN (dgemv) (&trans, &a_nc, &a_nr, &alpha, a.data (), &ld,
v.data (), &i_one, &beta, y, &i_one, 1L);
return RowVector (y, len);
}
// other operations
RowVector
map (d_d_Mapper f, const RowVector& a)
{
RowVector b (a);
b.map (f);
return b;
}
RowVector
map (d_c_Mapper f, const ComplexRowVector& a)
{
int a_len = a.length ();
RowVector b (a_len);
for (int i = 0; i < a_len; i++)
b.elem (i) = f (a.elem (i));
return b;
}
void
RowVector::map (d_d_Mapper f)
{
for (int i = 0; i < length (); i++)
elem (i) = f (elem (i));
}
double
RowVector::min (void) const
{
int len = length ();
if (len == 0)
return 0;
double res = elem (0);
for (int i = 1; i < len; i++)
if (elem (i) < res)
res = elem (i);
return res;
}
double
RowVector::max (void) const
{
int len = length ();
if (len == 0)
return 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 RowVector& a)
{
// int field_width = os.precision () + 7;
for (int i = 0; i < a.length (); i++)
os << " " /* setw (field_width) */ << a.elem (i);
return os;
}
istream&
operator >> (istream& is, RowVector& 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;
}
// other operations
RowVector
linspace (double x1, double x2, int n)
{
RowVector retval;
if (n > 0)
{
retval.resize (n);
double delta = (x2 - x1) / (n - 1);
retval.elem (0) = x1;
for (int i = 1; i < n-1; i++)
retval.elem (i) = x1 + i * delta;
retval.elem (n-1) = x2;
}
return retval;
}
// row vector by column vector -> scalar
double
operator * (const RowVector& v, const ColumnVector& a)
{
int len = v.length ();
if (len != a.length ())
{
(*current_liboctave_error_handler)
("nonconformant vector multiplication attempted");
return 0.0;
}
int i_one = 1;
return F77_FCN (ddot) (&len, v.data (), &i_one, a.data (), &i_one);
}
Complex
operator * (const RowVector& v, const ComplexColumnVector& a)
{
ComplexRowVector tmp (v);
return (tmp * a);
}
/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; page-delimiter: "^/\\*" ***
;;; End: ***
*/