On Apr 15, 2010, at 1:51 PM, prem_R wrote:
Hi,every one .I have searched the solutions in the forum for
replacing my
date value which is in a data frame ,01/01/2000 to 01-01-2000 using
replace
function but got the following warning message
x<-"2000/01/01"
xd<-as.data.frame(x)
xd$x<-replace(xd$x,xd$x=="/","-")
The replace function does not work with factors, it works with
(complete) vectors, not substrings. It's also a real hassle to do such
operations on factors, so just use character vectors and try gsub
instead:
> x<-"2000/01/01"
> xd<-as.data.frame(x, stringsAsFactors=FALSE)
> xd$x2<-gsub("/","-", xd$x)
> xd
x x2
1 2000/01/01 2000-01-01
Warning message:
In `[<-.factor`(`*tmp*`, list, value = "-") :
invalid factor level, NAs generated
Is there any other method of doing it? or am i missing something?.
please
let me know if you need any more information.
Thanks.
Prem
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