Hi
[EMAIL PROTECTED] napsal dne 19.11.2007 09:32:25:
> 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)$p.value
I am not sure if it is a best way but here seems to me that for cycle
could be considered
result<-rep(NA, 3999)
for (i in 2:4000) {
result [i-1] <- t.test(mat1[,i], mat2[,i])$p.value
}
Regards
Petr
>
> 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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