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- /* matrix/submatrix_source.c
- *
- * Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 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 3 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;
- }
- }
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