[R] Reg : using two different matrix : how to do t.test

[Weiwei Shi]

sapply(1:4000, function(k){
   t.test(Matrix1[,k], Matrix2[,k])$p.value
})


I did not test, though.

HTH,

Weiwei

On 11/19/07, sata pinal <satapinal at yahoo.com> wrote:
> I have two matrix with same dimensions. I want to do t.test using each column from 2 different matrix.
> Row n Column names in both matrix are same.
>
> e.g.
> Matrix1
> id VC1 VC2 VC3
> R 1 2 3
> R1 4 5 6
> R3 7 8 9
>
>
> Matrix2
> id VC1 VC2 VC3
> R 10 11 12
> R1 13 14 15
> R3 16 17 18
>
> want to do t.test using each column (with same name ) using Matrix1 and Matrix2
>
> for eg t.test(Matrix1$VC1, Matrix2$VC1)$p.value
>
> What is the best way to do it. I have dataset with 4000 columns for each matrix with same row and column names.
>
> Thanks a lot.
>
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-- 
Weiwei Shi, Ph.D
Research Scientist
GeneGO, Inc.

"Did you always know?"
"No, I did not. But I believed..."
---Matrix III