[R] extracting values from correlation matrix

[jim holtman]

Assuming that your data is in a dataframe 'cordata' , then following
should work:

cordata$cor2_value <- sapply(1:nrow(cordata), function(.row){
    cor2[cordata$rowname[.row], cordata$colname[.row]]
}

On Mon, Nov 16, 2009 at 11:44 AM, Lee William <leeonweb at gmail.com> wrote:
> Hi! All,
>
> I have 2 correlation matrices of 4000x4000 both with same row names and
> column names say cor1 and cor2. I have extracted some information from 1st
> matrix cor1 which is something like this:
>
> rowname  colname  cor1_value
>  a              b            0.8
>  b              a            0.8
>  c              f             0.62
>  d              k            0.59
>  -              -              --
>  -              -              --
>
> Now I wish to extract values from matrix cor2 for the same rowname and
> colname as above so that it looks similar to something like this with values
> in cor2_value:
>
> rowname  colname  cor1_value  cor2_value
>  a              b            0.8             ---
>  b              a            0.8             ---
>  c              f             0.62           ---
>  d              k            0.59           ---
>  -              -              --              ---
>  -              -              --              ---
>
> I am running out of ideas. So I decided to post this on mailing list. Please
> Help!
>
> Best
> Lee
>
>        [[alternative HTML version deleted]]
>
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-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

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