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https://issues.apache.org/jira/browse/MAHOUT-1532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13988069#comment-13988069
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Dmitriy Lyubimov commented on MAHOUT-1532:
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[~ssc] i think R solve also makes second parameter optional with a default
eye(). In our case we could just define yet another solve() with single
parameter that just returns an inverse. This is a bad practice but i think we
need it just to be consistent with R.
[~tdunning] what you are inquiring about i guess in our case analytically would
correspond to
{code}
solve(X.t %*% X - diag(lambda, X.nrow), X.t %*% y)
{code}
but solve() doesn't do it in either R nor i think it is an intent here either.
> Add solve() function to the Scala DSL
> --------------------------------------
>
> Key: MAHOUT-1532
> URL: https://issues.apache.org/jira/browse/MAHOUT-1532
> Project: Mahout
> Issue Type: Bug
> Components: Math
> Reporter: Sebastian Schelter
> Fix For: 1.0
>
> Attachments: MAHOUT-1532.patch
>
>
> We should add a solve() function to the Scala DSL with helps with solving Ax
> = b for in-core matrices and vectors.
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