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https://issues.apache.org/jira/browse/MATH-717?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13167387#comment-13167387
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Sébastien Brisard commented on MATH-717:
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Hello,
this might be a silly question, but I was wondering about the nature of the
data collected in your matrix. Is it "experimental"? In my case, I often have
huge matrices, but all coefficients are generated procedurally, which calls for
implementations where the matrix is *not* stored.
{{o.a.c.m.linear.RealLinearOperator}} was recently added to CM in order to
fullfill this need, together with iterative solvers. Not sure if that would be
of any help to you; besides, this is a very new feature, which would need to be
extended.
As for me, I was initially adverse to your proposal, because {{floats}} are
really ugly regarding precision. I am now only half adverse, *as long as all
internal calculations are carried out in double precision*.
> 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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