1 files changed, 66 insertions, 0 deletions
diff --git a/gsl-1.9/matrix/submatrix_source.c b/gsl-1.9/matrix/submatrix_source.c
new file mode 100644
index 0000000..9bfac27
--- /dev/null
+++ b/gsl-1.9/matrix/submatrix_source.c
@@ -0,0 +1,66 @@
+/* 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;
+  }
+}
+