[R] question

[R. Michael Weylandt]

Perhaps something (untested) like

sapply(split(x, rownames(x)), colSums)

Next time it's suggested you use dput() to send your data.

Michael

On Tue, Feb 14, 2012 at 7:08 AM, Soheila Khodakarim
<lkhodakarim at gmail.com> wrote:
> I have this matrix in R,
>
>
>   s1 s2 s3 s4
> g1  1  0  0  0
> g1  0  1  0  0
> g1  0  0  1  0
> g2  1  0  0  0
> g2  0  1  0  0
> g3  1  0  0  0
> g4  0  0  1  0
> g4  1  0  0  0
> g4  0  1  0  0
> g4  0  0  0  1
>
>
> I want to split this matrix based on its rows then sum based on columns,
> finally I want to make this matrix:
>
>   s1 s2 s3 s4
> g1  1  1  1  0
> g2  1  1  0  0
> g3  1  0  0  0
> g4  1  1  1  1
>
> I will appreciate if you guide me.
>
> Regards,
> Soheila
>
>        [[alternative HTML version deleted]]
>
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