what about something like:

dat <- data.frame(var1 = c("a","b"), var2 = c("c","d"))
dat$var3 <- sapply(dat, function(x) paste(dat$var1,dat$var2,sep=""))[,1]


Scott 
On Thursday, April 28, 2011 at 10:22 AM, Abraham Mathew wrote:
I've kind of solved the issue.
> 
> dat$Time <- paste(dat[,2], dat[,1], sep=" ")
> head(dat)
> dat[,c(1,2)] <- NA
> head(dat)
> 
> > head(dat)
> Year Month Number Time
> 1 NA NA 0 Jan 2002
> 2 NA NA 0 Feb 2002
> 3 NA NA 0 March 2002
> 4 NA NA 1 April 2002
> 5 NA NA 0 May 2002
> 6 NA NA 0 June 2002
> 
> unfortunately, can I delete the Year and Month Columns.
> Once that's done, I can reconfigure the columns
> 
> Abraham
> 
> On Thu, Apr 28, 2011 at 11:00 AM, Abraham Mathew <abmathewks@gmail.com>wrote:
> 
> > 
> > Hi folks, I have a simple question that I just can't solve.
> > 
> > I'm trying to merge two columns in my data frame.
> > 
> > > sessionInfo()
> > R version 2.13.0 (2011-04-13)
> > Platform: i686-pc-linux-gnu (32-bit)
> > 
> > > head(dat)
> > Year Month Number
> > 2002 Jan 0
> > 2002 Feb 0
> > 2002 March 0
> > 2002 April 1
> > 2002 May 0
> > 2002 June 0
> > 
> > I tried to do the following, but it doesn't work.
> > 
> > dat$Time <- merge(dat[,1], dat[,2])
> > head(dat)
> > 
> > 
> > Help, Abraham.
> 
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> 
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