Not implemented yet error

Hi, I'm doing a large matrix multiplication and it gives me a error message of " Not implemented yet". What's this error about? The possible reasons. Thanks.

2 Answers


Oh, sorry that I forgot to say, A* B , A is a normal matrix and B is a sparse matrix. If I use A* sptodense(B) then no error message. Just curious why A*B would report error.


This has not been implemented yet, because it is much, much more common to have a sparse coefficient matrix multiplied times a dense vector (or set of vectors in matrix form) than to reverse the order and it would also probably be an internal version of dense * sptodense(sparse), so the decreased memory footprint of the sparse matrix would not be retained anyway.

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