This takes care of things quite nicely.  The other solutions (explicitly 
coercing things) work as well, but this seems to me the minimum 
necessary solution for my particular problem. 

(P.s.:  I hope I responded in the correct way to ensure threading... to 
the main list address.) 

A<- data.frame(1,1,1); names(A)=letters[1:3] ; B<-matrix(0,2,3)
colnames(B) <- colnames(A)
rbind(A,B)

GL

jim holtman wrote:
> colnames(B) <- colnames(A)
>
> On 3/5/07, *Gregg Lind* <lind1199@umn.edu <mailto:lind1199@umn.edu>> 
> wrote:
>
>
>     As part of my work, I am trying to append matrices onto data frames.
>     Naively I assumed that when rbinding a data.frame and matrix, the
>     matrix
>     would be coerced and appended, keeping the names from the data frame.
>     Clearly, I am not fully understanding the process by which rbind
>     works.
>
>     Example code:
>
>     > A<- data.frame(1,1,1); names(A)=letters[1:3] ; B<-matrix(0,2,3)
>     > rbind(A,B)
>     Error in match.names(clabs, names(xi)) : names do not match
>     previous names:
>            V1, V2, V3
>     > rbind(A,as.data.frame(B))
>     Error in match.names(clabs, names(xi)) : names do not match
>     previous names:
>            V1, V2, V3
>
>
>
>     Is there a "right" way to combine the two such that the both end up
>     having the same column names?
>
>     I have tried to understand the deparse.level argument of rbind, but it
>     doesn't seem to do what I'm asking.
>
>     Thank you for any help you can give.
>
>
>     Gregg
>     --
>     Gregg Lind, M.S.
>
>     Division of Epidemiology and Community Health
>     School of Public Health
>     University of Minnesota, United States
>
>     ______________________________________________
>     R-help@stat.math.ethz.ch <mailto:R-help@stat.math.ethz.ch> mailing
>     list
>     https://stat.ethz.ch/mailman/listinfo/r-help
>     PLEASE do read the posting guide
>     http://www.R-project.org/posting-guide.html
>     and provide commented, minimal, self-contained, reproducible code.
>
>
>
>
> -- 
> Jim Holtman
> Cincinnati, OH
> +1 513 646 9390
>
> What is the problem you are trying to solve? 


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