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From "Edward J. Yoon" <>
Subject Re: How to differentiate sparse matrix from dense matrix?
Date Thu, 12 Nov 2009 05:49:03 GMT

There was a intention to apply other algorithm for multiplication.
Currently the algorithm design of sparse and dense is same based on
M/R, but the sparse matrix codes (e.g., with evaluation and
optimization) will be more complex than the dense case for High

If you find any odd things, please let us know. Thanks.

On Thu, Nov 12, 2009 at 3:07 AM, Yanfeng Zhang <> wrote:
> Hi, all
> I just read the source code on matrix multiplication, and there was a thing
> confusing me.
> On line 216 of, the getType() method will return an input
> matrix's type (sparse or dense). But I cann't quite understand how to
> differentiate it in the getType method.
> Since I am a beginer of Hadoop and HBase, I don't know HBase a lot. Is there
> a differentiation method in HBase?
> Thanks a lot for any reply!
> Regards,
> -Yanfeng

Best Regards, Edward J. Yoon @ NHN, corp.

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