Thanks to Justin, Baptiste, and Sebed for your answers.
The solutions work well. I have been putting them to good use today: the
code now works wonderfully and I learnt some useful tricks!
thanks, Peter
<-Original Message->
>From: justin bem [justin_...@yahoo.fr]
>Sent: 9/8/2009 9:06:2
may be this can work
testfun<-function(x) {
rval=""
k<-length(x)
for (i in 1: k) rval<-paste(rval,x[i],sep="-")
rval
}
v1<-paste("evalr",1:4,sep="")
eval<-expand.grid(w=v1,x=v1,y=v1,z=v1)
n<-dim(eval)[1]
results<-rep("", n)
for (i in 1:n) {
row<-unique(unlist(eval[i,]))
if (le
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