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Bug 1407 - Four-Matrix Sparse Multiply Doesn't Work
Summary: Four-Matrix Sparse Multiply Doesn't Work
Status: NEW
Alias: None
Product: Eigen
Classification: Unclassified
Component: Sparse (show other bugs)
Version: unspecified
Hardware: All All
: Normal Unknown
Assignee: Nobody
URL:
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Reported: 2017-03-17 02:23 UTC by citibeth
Modified: 2017-03-17 02:23 UTC (History)
2 users (show)



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Description citibeth 2017-03-17 02:23:44 UTC
If A, B, C and D are SparseMatrix instances, I can do:
   Eigen::SparseMatrix X(A*B*C)

But the following doesn't work, it yields a matrix that just zeros everything out:
   Eigen::SparseMatrix X(A*B*C*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.

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