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https://issues.apache.org/jira/browse/MATH-717?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13169327#comment-13169327
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Gilles commented on MATH-717:
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If I'm not mistaken, that would mean a complete copy/paste of the code of the
class (and its parents), replacing "double" by "float". This is easy to do
once; not nearly as easy to maintain!
I don't think that a feature aimed only at testing "small enough" problems is a
quite good reason to push in that direction. What would you be testing anyway,
since for the "real" problems, you'd have to switch to Sébastien's linear
operator framework?
Furthermore, the matrix API has been under discussion, and if we are going to
modify it, it should rather be done before adding more implementations.
Another thing to be aware is that if the "float" implementation exists, users
might start to ask for other classes in the "linear" package to be converted
(e.g. the "...Decomposition" classes).
Further discussions (about design issues) should probably be brought over to
the "dev" ML.
If your limitation is the Java heap memory in a 32-bit system, I'd suggest
going 64-bit and buying more RAM.
> A varied class of Array2DRowRealMatrix is needed to contain float type
> instead of double.
> -----------------------------------------------------------------------------------------
>
> Key: MATH-717
> URL: https://issues.apache.org/jira/browse/MATH-717
> Project: Commons Math
> Issue Type: Improvement
> Affects Versions: 2.2
> Environment: All
> Reporter: Dusan Ku
> Labels: features
>
> The current implementation of Array2DRowRealMatrix takes only double type as
> its base element value in the matrix.
> However, the memory size of double is bigger than float, the downside of
> which makes the matrix dimension quite limited, compared to float type as its
> base element type. For small sized problem, this does not make such a big
> difference, but for large problems, this limits the usability of this library
> quite severely. In my case, I easily hit an error even after I increase the
> memory option to 1G. This could have been much more enhanced just by using
> 'float[][]' instead of the current Array2DRowRealMatrix.
> Therefore, the solution I may suggest is to add another class similar to
> Array2DRowRealMatrix containing float type for its matrix variable instead of
> double. Of course, a better way is welcome as long as the needs can be
> fulfilled.
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