[datatable-help] How to get only those values out of a matrix that are in a list

[Matthew Dowle]

Hello Richelle,

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===============




> Hello everybody,
>
> I just started using R for my microarray analysis, so I am quite new to
> all
> of this. For now I have done preprocessing, normalization, limma and
> globaltest KEGG pathway analysis.
>
> I would like to see how each in gene in a certain pathway contributes the
> significance of the pathway. Therefore, I would like to combine the output
> of limma analysis and the genes that belong to a certain KEGG pathway.
> It is simple to get a list of genes that belong to a pathway in a vector,
> but I dont know how to pick only those genes from the limma toplist-file,
> with all the belonging statistics and make a new datamatrix from that. I
> hope my story is a bit clear, cause I dont know the exact R terminology.
>
> I have googled this, read many online introductions to R, but I cannot
> find
> it. I hope I havent posted this in the wrong place, but I hope that their
> is
> someone who can help me. Is there a function that is capable of picking
> only
> those elements from a datamatrix that correspond to the elements of a
> list?
> That's basically what the question comes down to.
>
> Many thanks!
>
> Regards
> Richelle
>
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