[R] pasting indexes to variables within loops

Frank Samuelson fws4 at cdrh.fda.gov
Tue Oct 19 22:11:58 CEST 2004

as.numeric(apply(haplo, 1 ,function(x) paste(x,collapse="")))

Kristin Kay Nicodemus wrote:
> Hi all,
> Hope someone can help me.  I start out with a matrix called haplo with 600 rows and two columns.  To start with, the elements of the matrix are character strings of 20 numbers.  I then want to create separate objects, called ha1-ha600, that are the concatenated 20 + 20 numbers, as numeric.  I am having no trouble doing anything except getting the index i to paste to the object ha(i) in some fashion.  When I do substring(haplo[(i)...) it works fine, but I can't seem to create objects that are ha1 or ha2 etc., containing the 40 number row I just created in the loop.  I've tried paste but I can't seem to get it to do the right thing.
> For this example, nc=20
> for (i in 1:600) {
> tst<-substring(haplo[(i),1],1:nc,1:nc)
> a1<-as.numeric(tst)
> tst<-substring(haplo[(i),2],1:nc,1:nc)
> a2<-as.numeric(tst)
> ha<-append(a1,a2)
> ha(i)<-ha # DOESN'T WORK
> }
> TIA,
> Kristin Nicodemus
> 	[[alternative HTML version deleted]]
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