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https://issues.apache.org/jira/browse/MATH-248?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Luc Maisonobe resolved MATH-248.
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Resolution: Fixed
fixed in subversion repository as of r762117
thanks for the report
> Multiplying sparse matrices is slow
> -----------------------------------
>
> Key: MATH-248
> URL: https://issues.apache.org/jira/browse/MATH-248
> Project: Commons Math
> Issue Type: Improvement
> Reporter: Christian Semrau
> Assignee: Luc Maisonobe
> Priority: Minor
> Fix For: 2.0
>
>
> The multiplication of sparse real matrices is very slow compared to real
> matrices: Ten times as slow for size 200, four times as slow for size 400.
> The time is independent of the number of nonzero entries, because the general
> algorithm inherited from AbstractRealMatrix is used. I suggest using a
> specialized multiplication algorithm for matrices that are "sparse enough",
> walking only over the nonzero entries in one of the matrices.
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