Hi
Thanks Gabor for your suggestion. I am posting the code that worked for me.


dataframe1 = data.frame(cbind(Src = c(1,1,1,2,3), Target1 =
c('aaa','bbb','ccc','aaa','ddd')));  #must be data frame
dataframe2 = data.frame(cbind(Src = c(2,3,4,4,4), Target2 =
c('aaaa','dddd','bbbb','eeee','ffff')));
dataframe3 = data.frame(cbind(Src = c(1,3,5,6,6), Target3 =
c('xx','yy','zz','tt','uu')));
dataframe4 = data.frame(cbind(Src = c(3,5,'y','z','z'), Target4 =
c('xx','yy','zz','tt','uu')));
L <- list(dataframe1, dataframe2, dataframe3, dataframe4)
merge.all <- function(...) merge(..., all = TRUE)
Reduce(merge.all, lapply(L, function(x) aggregate(x[2], x[1], toString)))

 Cheers !!!

-
M


On Tue, Jun 14, 2011 at 11:27 AM, Gabor Grothendieck <
ggrothendi...@gmail.com> wrote:

> On Tue, Jun 14, 2011 at 11:21 AM, Mary Kindall <mary.kind...@gmail.com>
> wrote:
> > I resolved it. There was a problem in type casting at some point in my
> > program.
> > Thanks again.
> > -
>
> Please post a corrected version of L for benefit of others who were
> following this.
>
> --
> Statistics & Software Consulting
> GKX Group, GKX Associates Inc.
> tel: 1-877-GKX-GROUP
> email: ggrothendieck at gmail.com
>



-- 
-------------
Mary Kindall
Yorktown Heights, NY
USA

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