[R] Rbind with data frames -- column names question

[Gregg Lind]

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