| /* matrix/submatrix_source.c |
| * |
| * Copyright (C) 1996, 1997, 1998, 1999, 2000 Gerard Jungman, Brian Gough |
| * |
| * 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. |
| * |
| * This program 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 this program; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| */ |
| |
| QUALIFIED_VIEW(_gsl_matrix,view) |
| FUNCTION (gsl_matrix, submatrix) (QUALIFIED_TYPE(gsl_matrix) * m, |
| const size_t i, const size_t j, |
| const size_t n1, const size_t n2) |
| { |
| QUALIFIED_VIEW(_gsl_matrix,view) view = NULL_MATRIX_VIEW; |
| |
| if (i >= m->size1) |
| { |
| GSL_ERROR_VAL ("row index is out of range", GSL_EINVAL, view); |
| } |
| else if (j >= m->size2) |
| { |
| GSL_ERROR_VAL ("column index is out of range", GSL_EINVAL, view); |
| } |
| else if (n1 == 0) |
| { |
| GSL_ERROR_VAL ("first dimension must be non-zero", GSL_EINVAL, view); |
| } |
| else if (n2 == 0) |
| { |
| GSL_ERROR_VAL ("second dimension must be non-zero", GSL_EINVAL, view); |
| } |
| else if (i + n1 > m->size1) |
| { |
| GSL_ERROR_VAL ("first dimension overflows matrix", GSL_EINVAL, view); |
| } |
| else if (j + n2 > m->size2) |
| { |
| GSL_ERROR_VAL ("second dimension overflows matrix", GSL_EINVAL, view); |
| } |
| |
| { |
| TYPE(gsl_matrix) s = NULL_MATRIX; |
| |
| s.data = m->data + MULTIPLICITY * (i * m->tda + j); |
| s.size1 = n1; |
| s.size2 = n2; |
| s.tda = m->tda; |
| s.block = m->block; |
| s.owner = 0; |
| |
| view.matrix = s; |
| return view; |
| } |
| } |
| |