GVector.cpp
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/***************************************************************************
* GVector.cpp - vector class *
* ----------------------------------------------------------------------- *
* copyright : (C) 2006 by Jurgen Knodlseder *
* ----------------------------------------------------------------------- *
* *
* 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. *
* *
***************************************************************************/
/* __ Includes ___________________________________________________________ */
#include "GVector.hpp"
/*==========================================================================
= =
= GVector constructors/destructors =
= =
==========================================================================*/
/***************************************************************************
* GVector constructor *
***************************************************************************/
GVector::GVector(int num)
{
// Throw exception if requested vector length is zero
if (num == 0)
throw empty("GVector constructor");
// Allocate vector array. Throw exception if allocation failed
m_data = new double[num];
if (m_data == NULL)
throw mem_alloc("GVector constructor", num);
// Store vector size and initialize elements to 0.0
m_num = num;
for (int i = 0; i < m_num; ++i)
m_data[i] = 0.0;
// Return
return;
}
/***************************************************************************
* GVector copy constructor *
***************************************************************************/
GVector::GVector(const GVector& v)
{
// Allocate vector array. Throw exception if allocation failed
m_data = new double[v.m_num];
if (m_data == NULL)
throw mem_alloc("GVector copy constructor", v.m_num);
// Store vector size and copy elements
m_num = v.m_num;
for (int i = 0; i < m_num; ++i)
m_data[i] = v.m_data[i];
// Return
return;
}
/***************************************************************************
* GVector destructor *
***************************************************************************/
GVector::~GVector()
{
// Deallocate only if memory has indeed been allocated
if (m_data != NULL) delete[] m_data;
// Return
return;
}
/*==========================================================================
= =
= GVector operators =
= =
==========================================================================*/
/***************************************************************************
* GVector assignment operator *
***************************************************************************/
GVector& GVector::operator= (const GVector& v)
{
// Assign only if not identical
if (this != &v) {
// First delete old data if it exists
if (m_data != NULL) delete [] m_data;
// Allocate vector array. Throw exception if allocation failed
m_data = new double[v.m_num];
if (m_data == NULL)
throw mem_alloc("GVector assignment operator", v.m_num);
// Store vector size and copy elements
m_num = v.m_num;
for (int i = 0; i < m_num; ++i)
m_data[i] = v.m_data[i];
}
// Return vector
return *this;
}
/*==========================================================================
= =
= GVector member functions =
= =
==========================================================================*/
/***************************************************************************
* Returns number of non-zeros in vector *
***************************************************************************/
int GVector::non_zeros() const
{
// Initialise number of non-zeros
int non_zeros = 0;
// Gather all non-zero elements
for (int i = 0; i < m_num; ++i) {
if (m_data[i] != 0.0)
non_zeros++;
}
// Return number of non-zero elements
return non_zeros;
}
/*==========================================================================
= =
= GVector private functions =
= =
==========================================================================*/
/*==========================================================================
= =
= GVector friends =
= =
==========================================================================*/
/***************************************************************************
* GVector output operator *
***************************************************************************/
ostream& operator<< (ostream& os, const GVector& v)
{
for (int i = 0; i < v.m_num; ++i) {
os << v(i);
if (i != v.m_num-1)
os << ", ";
}
return os;
}
/***************************************************************************
* GVector cross product *
***************************************************************************/
GVector cross(const GVector &a, const GVector &b)
{
if (a.m_num != b.m_num)
throw GVector::dim_mismatch("GVector cross product", a.m_num, b.m_num);
if (a.m_num != 3)
throw GVector::bad_cross_dim(a.m_num);
GVector result(3);
result(0) = a.m_data[1]*b.m_data[2] - a.m_data[2]*b.m_data[1];
result(1) = a.m_data[2]*b.m_data[0] - a.m_data[0]*b.m_data[2];
result(2) = a.m_data[0]*b.m_data[1] - a.m_data[1]*b.m_data[0];
return result;
}
/*==========================================================================
= =
= GSparseMatrix exception classes =
= =
==========================================================================*/
/***************************************************************************
* Class exception handlers *
***************************************************************************/
// Vector index out of range
GVector::out_of_range::out_of_range(string origin, int inx, int elements)
{
m_origin = origin;
if (elements > 0) {
ostringstream s_inx;
ostringstream s_elements;
s_inx << inx;
s_elements << elements-1;
m_message = "Vector index (" + s_inx.str() + ") out of range [0," +
s_elements.str() + "]";
}
else {
m_message = "Empty vector";
}
}
// Vector dimensions differ
GVector::dim_mismatch::dim_mismatch(string origin, int size1, int size2)
{
m_origin = origin;
ostringstream s_size1;
ostringstream s_size2;
s_size1 << size1;
s_size2 << size2;
m_message = "Vector dimensions differ (" + s_size1.str() + " <-> " +
s_size2.str() + ")";
}
// Invalid vector dimension for cross product
GVector::bad_cross_dim::bad_cross_dim(int elements)
{
ostringstream s_elements;
s_elements << elements;
m_message = "Vector cross product only defined for 3 dimensions but vector size is " +
s_elements.str();
}