[jira] [Commented] (MATH-719) Strange deprecations in API

["Gilles (Commented) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MATH-719?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13163737#comment-13163737 ] 

Gilles commented on MATH-719:
-----------------------------

bq. Sorry if this doesn't belong here.

Indeed, you'd better bring this kind of issue to the "dev" ML. :)
The more so that there have been recent discussions about changing the matrix API and decisions ought to be made quite soon now.

                
> Strange deprecations in API
> ---------------------------
>
>                 Key: MATH-719
>                 URL: https://issues.apache.org/jira/browse/MATH-719
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 2.0, 2.1, 2.2
>            Reporter: Peter Bloem
>            Priority: Minor
>              Labels: api-change, deprecated
>
> Sorry if this doesn't belong here. I couldn't find any sort of mailing list or other feedback mechanism on the website.
> RealMatrix has some very odd deprecations. In particular inverse(), getDeterminant() and isSingular(). The last has the message:
> bq. Deprecated. as of release 2.0, replaced by the boolean negation of new LUDecompositionImpl(m).getSolver().isNonSingular()
> That's an implementation, not an interface. The whole point of having an interface is that 
> * I can query whether a matrix is singular withou having to know about LUDecompositions
> * You guys can change the implementation of isSingular() if something better pops up without us guys having to change our code.
> I'm not using these methods now, because they're deprecated, but I've basically recreated them in as static methods in a utility class. Wouldn't it be much better to just put code from the deprecation message into the method and remove the deprecation?

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