Four-Matrix Sparse Multiply Doesn't Work

Submitted by citibeth

Assigned to Nobody

Link to original bugzilla bug (#1407)

Description

If A, B, C and D are SparseMatrix instances, I can do:
Eigen::SparseMatrix X(ABC)

But the following doesn't work, it yields a matrix that just zeros everything out:
Eigen::SparseMatrix X(ABC*D)

So it seems that Eigen can handle multiplying three matrices in one expression, but not four. For the latter case, splitting it up into two multiply steps works.