Hi Jun,
As you do seem to want to replace commas within, not between, strings, try gsub:
gsub(",",";",test[,1])
Jim
> Dear list,
>
> Say I have a data frame
>
> test <- data.frame(C1=c('a,b,c,d'),C2=c('g,h,f'))
>
> I want to replace the commas with semicolons
>
> sub(',',';',test$C1) -> test$C1 will only replace the first comma of a
> string.
>
> How do I replace them all in one run? Thanks.
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