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#ifndef _NL_VECTOR_H_
#define _NL_VECTOR_H_
#include <cassert>
#include <utility>
#include <gsl/gsl_vector.h>
namespace Geom { namespace NL {
class Vector;
void swap(Vector & v1, Vector & v2);
class Vector
{
public:
Vector(size_t n)
: m_size(n)
{
m_vector = gsl_vector_alloc(n);
}
Vector(size_t n, double x)
: m_size(n)
{
m_vector = gsl_vector_alloc(n);
gsl_vector_set_all(m_vector, x);
}
// create a vector with n elements all set to zero
// but the i-th that is set to 1
Vector(size_t n, size_t i)
: m_size(n)
{
m_vector = gsl_vector_alloc(n);
gsl_vector_set_basis(m_vector, i);
}
Vector(Vector const& _vector)
: m_size(_vector.size())
{
m_vector = gsl_vector_alloc(size());
gsl_vector_memcpy(m_vector, _vector.m_vector);
}
virtual ~Vector()
{
gsl_vector_free(m_vector);
}
Vector & operator=(Vector const& _vector)
{
assert( size() == _vector.size() );
gsl_vector_memcpy(m_vector, _vector.m_vector);
}
void set_all(double x = 0)
{
gsl_vector_set_all(m_vector, x);
}
void set_basis(size_t i)
{
gsl_vector_set_basis(m_vector, i);
}
double const& operator[](size_t i) const
{
return *gsl_vector_const_ptr(m_vector, i);
}
double & operator[](size_t i)
{
return *gsl_vector_ptr(m_vector, i);
}
gsl_vector* get_gsl_vector()
{
return m_vector;
}
void swap_elements(size_t i, size_t j)
{
gsl_vector_swap_elements(m_vector, i, j);
}
void reverse()
{
gsl_vector_reverse(m_vector);
}
Vector & scale(double x)
{
gsl_vector_scale(m_vector, x);
return (*this);
}
Vector & translate(double x)
{
gsl_vector_add_constant(m_vector, x);
return (*this);
}
Vector & operator+=(Vector const& _vector)
{
gsl_vector_add(m_vector, _vector.m_vector);
return (*this);
}
Vector & operator-=(Vector const& _vector)
{
gsl_vector_sub(m_vector, _vector.m_vector);
return (*this);
}
bool is_zero() const
{
return gsl_vector_isnull(m_vector);
}
bool is_positive() const
{
return gsl_vector_ispos(m_vector);
}
bool is_negative() const
{
return gsl_vector_isneg(m_vector);
}
bool is_non_negative() const
{
for ( size_t i = 0; i < size(); ++i )
{
if ( (*this)[i] < 0 ) return false;
}
return true;
}
double max() const
{
return gsl_vector_max(m_vector);
}
double min() const
{
return gsl_vector_min(m_vector);
}
size_t max_index() const
{
return gsl_vector_max_index(m_vector);
}
size_t min_index() const
{
return gsl_vector_min_index(m_vector);
}
friend
void swap(Vector & v1, Vector & v2);
size_t size() const
{
return m_size;
}
private:
size_t m_size;
gsl_vector* m_vector;
};
void swap(Vector & v1, Vector & v2)
{
assert( v1.size() == v2.size() );
std::swap(v1.m_vector, v2.m_vector);
}
} } // end namespaces
#endif /*_NL_VECTOR_H_*/
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