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

[Moshe Olshansky]

Since t.test takes much more time than parsing loop, I
won't hesitate to do a loop on the columns.

--- 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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