source: src/gslvector.cpp@ 5be0eb

/*
 * gslvector.cpp
 *
 *  Created on: Jan 8, 2010
 *      Author: heber
 */

#include "gslvector.hpp"

/** Constructor of class GSLVector.
 * Allocates GSL structures
 * \param m dimension of vector
 */
GSLVector::GSLVector(size_t m) : dimension(m)
{
  vector = gsl_vector_calloc(dimension);
};

/** Copy constructor of class GSLVector.
 * Allocates GSL structures and copies components from \a *src.
 * \param *src source vector
 */
GSLVector::GSLVector(const GSLVector * const src) : dimension(src->dimension)
{
  vector = gsl_vector_alloc(dimension);
  gsl_vector_memcpy (vector, src->vector);
};

/** Destructor of class GSLVector.
 * Frees GSL structures
 */
GSLVector::~GSLVector()
{
  gsl_vector_free(vector);
  dimension = 0;
};

/* ============================ Accessing =============================== */
/** This function sets the vector from a double array.
 * Creates a vector view of the array and performs a memcopy.
 * \param *x array of values (no dimension check is performed)
 */
void GSLVector::SetFromDoubleArray(double * x)
{
  gsl_vector_view m = gsl_vector_view_array (x, dimension);
  gsl_vector_memcpy (vector, &m.vector);
};

/** This function returns the i-th element of a vector.
 * If \a m lies outside the allowed range of 0 to GSLVector::dimension-1 then the error handler is invoked and 0 is returned.
 * \param m m-th element
 * \return  m-th element of vector
 */
double GSLVector::Get(size_t m)
{
  return gsl_vector_get (vector, m);
};

/** This function sets the value of the \a m -th element of a vector to \a x.
 *  If \a m lies outside the allowed range of 0 to GSLVector::dimension-1 then the error handler is invoked.
 * \param m-th element to set
 * \param x value to set to
 */
void GSLVector::Set(size_t m, double x)
{
  gsl_vector_set (vector, m, x);
};

/** These functions return a pointer to the \a m-th element of a vector.
 *  If \a m lies outside the allowed range of 0 to GSLVector::dimension-1 then the error handler is invoked and a null pointer is returned.
 * \param m m-th element
 * \return pointer to \a m-th element
 */
double *GSLVector::Pointer(size_t m)
{
  return gsl_vector_ptr (vector, m);
};

/** These functions return a constant pointer to the \a m-th element of a vector.
 *  If \a m lies outside the allowed range of 0 to GSLVector::dimension-1 then the error handler is invoked and a null pointer is returned.
 * \param m m-th element
 * \return const pointer to \a m-th element
 */
const double *GSLVector::const_Pointer(size_t m)
{
  return gsl_vector_const_ptr (vector, m);
};

/* ========================== Initializing =============================== */
/** This function sets all the elements of the vector to the value \a x.
 * \param *x
 */
void GSLVector::SetAll(double x)
{
  gsl_vector_set_all (vector, x);
};

/** This function sets all the elements of the vector to zero.
 */
void GSLVector::SetZero()
{
  gsl_vector_set_zero (vector);
};

/** This function makes a basis vector by setting all the elements of the vector to zero except for the i-th element which is set to one.
 * \param i i-th component to set to unity (all other to zero)
 * \return vector set
 */
int GSLVector::SetBasis(size_t i)
{
  return gsl_vector_set_basis (vector, i);
};

/* ====================== Exchanging elements ============================ */
/** This function exchanges the \a i-th and \a j-th elements of the vector in-place.
 * \param i i-th element to swap with ...
 * \param j ... j-th element to swap against
 */
int GSLVector::SwapElements(size_t i, size_t j)
{
  return gsl_vector_swap_elements (vector, i, j);
};

/** This function reverses the order of the elements of the vector.
 */
int GSLVector::Reverse()
{
  return gsl_vector_reverse (vector);
};