Dear Anjali,

This should work:
mymat <- matrix(rnorm(4*136), ncol=136)
i <- 2
while(i <=121){
print(cor(t(mymat[1:2, i:(i+14)])))
i <- i+15
}

Best,
Dave.

-- 
Dave Armstrong
University of Maryland
Dept of Government and Politics
3140 Tydings Hall
College Park, MD 20742
Office: 2103L Cole Field House
Phone: 301-405-9735
e-mail: darmstrong@gvpt.umd.edu
web: www.davearmstrong-ps.com

On 5/17/06, rajaa@uchicago.edu <rajaa@uchicago.edu> wrote:
>
> Hello,
>
> I would like to run a correlation on values in a table that
> has 4 rows and 136 columns. However, I am only interested in
> correlating the values in alternating blocks of 15 columns.
> For example, I would like to correlate the values in row 1,
> columns 2-16:31-46:61-76:91-106 with values in row 2, columns
> 2-16:31-46:61-76:91-106.
>
> Is there a way to notate this in the cor command so that the
> function will specify nonsequential values from the table?
>
> Thanks for any help.
>
> Sincerely,
>
> Anjali
>
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