Mercurial > hg > octave-lyh

changeset 16803:f4eef73b6e90

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
When indexing scalars stored as sparse matrices, convert to an array, index and then resparsify (bug #37774) * Sparse.cc (template <class T> Sparse<T> Sparse<T>::index (const idx_vector&, *bool) const): If scalar stored in a sparse matrix, treat as an array and resparsify
author David Bateman <dbateman@free.fr>
date Sat, 22 Jun 2013 12:00:39 +0200
parents 9302e92df412
children 617a6e5a974a
files liboctave/array/Sparse.cc
diffstat 1 files changed, 8 insertions(+), 0 deletions(-) [+]
line wrap: on
line diff
--- a/liboctave/array/Sparse.cc
+++ b/liboctave/array/Sparse.cc
@@ -1575,6 +1575,14 @@
       else
         gripe_index_out_of_range (2, 2, idx_j.extent (nc), nc);
     }
+  else if (nr == 1 && nc == 1)
+    {
+      // Scalars stored as sparse matrices occupy more memory than 
+      // a scalar, so let's just convert the matrix to full, index, 
+      // and sparsify the result.
+
+      retval = Sparse<T> (array_value ().index (idx_i, idx_j));
+    }
   else if (idx_i.is_colon ())
     {
       // Great, we're just manipulating columns. This is going to be quite