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https://issues.apache.org/jira/browse/SPARK-11826?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15020719#comment-15020719
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Ehsan Mohyedin Kermani commented on SPARK-11826:
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My main (major) motivation is related to
[6417](https://issues.apache.org/jira/browse/SPARK-6417) and heavily using
basic operations and possibly, later distributed linalg use cases. The only
solution I can think of using add() only, would be multiplying each block after
transforming toBreeze(), by negative identity for example, and perform the
addition which ultimately is the subtract() (obvious implementation from
add()), so it'd be a great help if we can have this and without it I'm not sure
how we can achieve it differently? It might be a case that I'm missing
something trivial here though!
> Subtract BlockMatrix
> --------------------
>
> Key: SPARK-11826
> URL: https://issues.apache.org/jira/browse/SPARK-11826
> Project: Spark
> Issue Type: Improvement
> Components: MLlib
> Affects Versions: 1.6.0
> Reporter: Ehsan Mohyedin Kermani
> Priority: Minor
>
> It'd be more convenient to have subtract method for BlockMatrices.
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