add experimental code for sparse matrix:

 - uses the common "Compressed Column Storage" scheme
 - supports every unary and binary operators with xpr template
   assuming binaryOp(0,0) == 0 and unaryOp(0) = 0 (otherwise a sparse
   matrix doesnot make sense)
 - this is the first commit, so of course, there are still several shorcommings !

1 files changed, 16 insertions, 0 deletions

diff --git a/Eigen/Sparse b/Eigen/Sparse
new file mode 100644
index 000000000..6a5eaf6a0
--- /dev/null
+++ b/Eigen/Sparse
@@ -0,0 +1,16 @@
+#ifndef EIGEN_SPARSE_MODULE_H
+#define EIGEN_SPARSE_MODULE_H
+
+#include "Core"
+#include <vector>
+#include <map>
+
+namespace Eigen {
+
+#include "src/Sparse/SparseArray.h"
+#include "src/Sparse/SparseMatrix.h"
+#include "src/Sparse/CoreIterators.h"
+
+} // namespace Eigen
+
+#endif // EIGEN_SPARSE_MODULE_H