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#ifndef SEEN_NR_MATRIX_FNS_H
#define SEEN_NR_MATRIX_FNS_H
#include "nr-matrix.h"
namespace NR {
/** Given a matrix m such that unit_circle = m*x, this returns the
* quadratic form x*A*x = 1. */
Matrix elliptic_quadratic_form(Matrix const &m);
/** Given a matrix (ignoring the translation) this returns the eigen
* values and vectors. */
class Eigen{
public:
Point vectors[2];
Point values;
Eigen(Matrix const &m);
};
// Matrix factories
Matrix from_basis(const Point x_basis, const Point y_basis, const Point offset=Point(0,0));
Matrix identity();
double expansion(Matrix const &m);
bool transform_equalp(Matrix const &m0, Matrix const &m1, NR::Coord const epsilon);
bool translate_equalp(Matrix const &m0, Matrix const &m1, NR::Coord const epsilon);
bool matrix_equalp(Matrix const &m0, Matrix const &m1, NR::Coord const epsilon);
Matrix transform(Matrix const &m);
translate get_translation(Matrix const &m);
void matrix_print(const gchar *say, Matrix const &m);
} // namespace NR
#endif /* !SEEN_NR_MATRIX_FNS_H */
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :
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