[R] looking for a cleaner way to do something

[Gabor Grothendieck]

Try this:

X <- structure(11:15, .Names = letters[1:5])
Y <- structure(21:25, .Names = letters[1:5])

rbind(group1 = X, group2 = Y)
tab <- rbind(group1 = X, group2 = Y)
tab[,-1] / tab[,1]

On 10/17/06, Leeds, Mark (IED) <Mark.Leeds at morganstanley.com> wrote:
> I have two numeric vectors each of length 17 and each is named the exact
> same way.
>
> so
>                obsnum ppppp  ppppm pppmp . dot dot dot......
> temp1    is    1417    52         63       85
>
>                 obsnum ppppp  ppppm pppmp . dot dot dot......
> temp2     is   1213     41        50       97
>
> what i want to have is a resultant matrix with 2 rows and 16 columns
> where the 16 columns are the 2:17 columns divided by the respective
> first element in each vector.
> ( so 52, 63 and 85 should all get divided by 1417  and 41, 50 and 97
> should all be divided by 1213 ).
>
> it doesn't have to retain the column names because i can just assign
> them again when i am assigning the rownames.
>
> below is my  code :
>
> resultmatrix<-rbind(temp1,temp2)
> resultmatrix<-resultmatrix[,2:17]/resultmatrix[,1]
>
> colnames(resultmatrix)<-colnames(temp1)
> rownames(resultmatrix)<-c("group1","group2")
>
> I'm pretty sure above will work but it seemed kind of ugly and I
> wondering if there is a better way because i am trying to improve in R.
> if there isn't, that's fine. thanks.
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