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/***************************************************************************
* Copyright (C) 2003-2004 by David Saxton *
* david@bluehaze.org *
* *
* This program 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 of the License, or *
* (at your option) any later version. *
***************************************************************************/
#include "vec.h"
#include <assert.h>
#include <cmath>
#include <string.h>
using namespace std;
Vector::Vector( const int size )
{
m_size = size;
m_vec = new double[m_size];
reset();
b_changed = true;
}
Vector::~Vector()
{
// Hmm...this looks like it's the correct format, although valgrind complains
// about improper memory use. Interesting. "delete m_vec" definitely leaks
// memory, so this seems like the lesser of two evils. I miss C memory allocation
// somtimes, with a nice simple free :p
delete [] m_vec;
}
void Vector::reset()
{
for ( int i=0; i<m_size; i++ )
{
m_vec[i] = 0.;
}
b_changed = true;
}
void Vector::limitTo( double scaleMax, Vector * limitVector )
{
assert( limitVector );
assert( limitVector->size() == size() );
for ( int i = 0; i < m_size; ++i )
{
double limitAbs = std::abs( limitVector->m_vec[i] );
if ( limitAbs < 1e-6 )
limitAbs = 1e-6;
double thisAbs = std::abs( m_vec[i] );
if ( thisAbs < 1e-6 )
thisAbs = 1e-6;
if ( (thisAbs / limitAbs) > scaleMax )
m_vec[i] /= (thisAbs / limitAbs);
else if ( (limitAbs / thisAbs) > scaleMax )
m_vec[i] /= (limitAbs / thisAbs);
}
b_changed = true;
}
void Vector::operator += ( Vector *rhs )
{
if (!rhs) return;
for ( int i=0; i<m_size; i++ )
{
m_vec[i] += (*rhs)[i];
}
b_changed = true;
}
void Vector::operator -= ( Vector *rhs )
{
if (!rhs) return;
for ( int i=0; i<m_size; i++ )
{
m_vec[i] -= (*rhs)[i];
}
b_changed = true;
}
void Vector::operator *=( double s )
{
for ( int i=0; i<m_size; i++ )
{
m_vec[i] *= s;
}
b_changed = true;
}
void Vector::operator = ( Vector& v )
{
assert( size() == v.size() );
memcpy( m_vec, v.m_vec, m_size * sizeof( double ) );
b_changed = true;
}
void Vector::negative( Vector *rhs )
{
if (!rhs) return;
for ( int i=0; i<m_size; i++ )
{
m_vec[i] = -(*rhs)[i];
}
b_changed = true;
}
double Vector::abs() const
{
double s=0;
for ( int i=0; i<m_size; i++ )
{
s += m_vec[i]*m_vec[i];
}
return sqrt(s);
}
// matrix stuff...
matrix::matrix( const uint size )
{
m_size = size;
m_mat = new Vector*[m_size];
for ( uint i=0; i<m_size; ++i )
{
m_mat[i] = new Vector(m_size);
}
}
matrix::~matrix()
{
for ( uint i=0; i<m_size; ++i )
{
delete m_mat[i];
}
delete [] m_mat;
}
void matrix::swapRows( const uint a, const uint b )
{
if ( a == b ) return;
Vector *v = m_mat[a];
m_mat[a] = m_mat[b];
m_mat[b] = v;
}
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