[R] Correlation between 2 matrices but with subset of variables

[chuck.01]

Example data would be helpful 



A Ezhil wrote
> 
> Dear All,
> I have two matrices A (40 x 732) and B (40 x 1230) and would like to
> calculate correlation between them.  I can use: cor(A,B, method="pearson")
> to calculate correlation between all possible pairs. But the issue is that
> there is one-many specific mappings between A and B and I just need to
> calculate correlations for those pairs (not all). Some variables in A
> (proteins, say p1) have more than 3 (or 2 or 1) corresponding mapping in B
> (mRNA, say, m1,m2,m3) and I would like calculate correlations between
> p1-m1, p1-m2, and p1-m3 and then for the second variable p2 etc. 
> I have the mapping information in another file (annotation file). Could
> you please suggest me how to do that?
> Thanks in advance.
> Kind regards,Ezhil  
> 	[[alternative HTML version deleted]]
> 
> 
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