Hi
[EMAIL PROTECTED] napsal dne 20.11.2007 09:36:32:
>
> Hi Thanks for the reply.
>
> I implemented your solution to my problem but ...
>
> For some of my column there is not enough data to do t-test so it gives
me
> error and stops the for loop, is any graceful way to check for error msg
and
> say ok if there is no $p.value continue to the next column
You need at least 2 values for x and 2 values for y so you can just put an
if clause in your for loop. Something like:
for (whatever) {
if(sum(!is.na(x)>1 & sum(!is.na(y)>1) do your t.test
}
Regards
Petr
>
> Once again thx for help.
>
>
>
> sata pinal wrote:
> >
> > I have two matrix with same dimensions. I want to do t.test using each
> > column from 2 different matrix.
> > Row n Column names in both matrix are same.
> >
> > e.g.
> > Matrix1
> > id VC1 VC2 VC3
> > R 1 2 3
> > R1 4 5 6
> > R3 7 8 9
> >
> >
> > Matrix2
> > id VC1 VC2 VC3
> > R 10 11 12
> > R1 13 14 15
> > R3 16 17 18
> >
> > want to do t.test using each column (with same name ) using Matrix1
and
> > Matrix2
> >
> > for eg t.test(Matrix1$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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