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/*
Copyright 2008 Brain Research Institute, Melbourne, Australia
Written by J-Donald Tournier, 27/06/08.
This file is part of MRtrix.
MRtrix 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 3 of the License, or
(at your option) any later version.
MRtrix is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with MRtrix. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __math_matrix_h__
#define __math_matrix_h__
#include <gsl/gsl_matrix.h>
#include <gsl/gsl_blas.h>
#include "mrtrix.h"
namespace MR {
namespace Math {
class Matrix
{
protected:
gsl_matrix* M;
public:
Matrix ();
Matrix (const Matrix& mat);
Matrix (guint n_rows, guint n_columns);
~Matrix ();
Matrix& operator= (const Matrix& A);
guint rows () const;
guint columns () const;
bool is_valid () const;
void allocate (const Matrix& mat);
void allocate (guint n_rows, guint n_columns);
void copy (const Matrix &mat);
void copy (guint n_rows, guint n_columns, const double* data);
void reset ();
void zero ();
void identity ();
double& operator() (guint i, guint j) const;
double min () const;
double max () const;
void load (const String& filename);
void save (const String& filename) const;
gsl_matrix* get_gsl_matrix () const;
void add (const Matrix& A);
void add (double v);
void subtract (const Matrix& A);
void multiply (const Matrix& A, const Matrix& B);
void multiply (double v);
void multiply_elements (const Matrix& A);
void divide_elements (const Matrix& A);
void transpose (const Matrix& A);
void transpose ();
void print () const;
friend std::ostream& operator<< (std::ostream& stream, const Matrix& M);
};
bool operator!= (const Matrix& left, const Matrix& right);
bool operator== (const Matrix& left, const Matrix& right);
inline Matrix::Matrix () { M = NULL; }
inline Matrix::Matrix (const Matrix& mat) { M = NULL; copy (mat); }
inline Matrix::Matrix (guint n_rows, guint n_columns) { M = NULL; allocate (n_rows, n_columns); }
inline Matrix::~Matrix () { if (M) gsl_matrix_free (M); }
inline Matrix& Matrix::operator= (const Matrix& A) { copy (A); return (*this); }
inline void Matrix::copy (const Matrix &A) { allocate(A); if (M) gsl_matrix_memcpy (M, A.M); }
inline void Matrix::copy (guint n_rows, guint n_columns, const double* data)
{
allocate (n_rows, n_columns);
for (guint row = 0; row < n_rows; row++)
for (guint col = 0; col < n_columns; col++)
(*this)(row, col) = data [col + n_columns*row];
}
inline void Matrix::reset () { if (M) gsl_matrix_free (M); M = NULL; }
inline void Matrix::allocate (const Matrix& mat) { allocate (mat.rows(), mat.columns()); }
inline guint Matrix::rows () const { if (!M) return(0); return (M->size1); }
inline guint Matrix::columns () const { if (!M) return(0); return (M->size2); }
inline bool Matrix::is_valid () const { return (M); }
inline void Matrix::zero () { gsl_matrix_set_zero (M); }
inline void Matrix::identity () { gsl_matrix_set_identity (M); }
inline double &Matrix::operator() (guint i, guint j) const { return (M->data[i * M->tda + j]); }
inline gsl_matrix *Matrix::get_gsl_matrix () const { return (M); }
inline double Matrix::min () const { return (gsl_matrix_min(M)); }
inline double Matrix::max () const { return (gsl_matrix_max(M)); }
inline void Matrix::transpose (const Matrix& A)
{
allocate(A.columns(), A.rows());
if (gsl_matrix_transpose_memcpy (M, A.M)) throw Exception ("matrix");
}
inline void Matrix::transpose () { if (gsl_matrix_transpose(M)) throw Exception ("matrix"); }
inline void Matrix::add (const Matrix& A) { if (gsl_matrix_add (M, A.M)) throw Exception ("matrix"); }
inline void Matrix::add (double v) { if (gsl_matrix_add_constant (M, v)) throw Exception ("matrix"); }
inline void Matrix::subtract (const Matrix& A ) { if (gsl_matrix_sub (M, A.M)) throw Exception ("matrix"); }
inline void Matrix::multiply (double v) { if (gsl_matrix_scale (M, v)) throw Exception ("matrix"); }
inline void Matrix::multiply_elements (const Matrix& A) { if (gsl_matrix_mul_elements (M, A.M)) throw Exception ("matrix"); }
inline void Matrix::divide_elements (const Matrix& A) { if (gsl_matrix_div_elements (M, A.M)) throw Exception ("matrix"); }
inline void Matrix::allocate (guint n_rows, guint n_columns)
{
if (M) {
if (rows() == n_rows && columns() == n_columns) return;
gsl_matrix_free (M);
}
M = ( n_rows && n_columns ? gsl_matrix_alloc (n_rows, n_columns) : NULL );
}
inline void Matrix::multiply (const Matrix& A, const Matrix& B)
{
allocate (A.rows(), B.columns());
if (gsl_blas_dgemm (CblasNoTrans, CblasNoTrans, 1.0, A.M, B.M, 0.0, M)) throw Exception ("matrix");
}
inline bool operator!= (const Matrix& left, const Matrix& right)
{
if (left.rows() != right.rows() || left.columns() != right.columns()) return (true);
for (guint j = 0; j < left.columns(); j++)
for (guint i = 0; i < left.rows(); i++)
if (left(i,j) != right(i,j))
return (true);
return (false);
}
inline bool operator== (const Matrix& left, const Matrix& right) { return (! (left != right)); }
}
}
#endif
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