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

[David Barron]

I don't know if this is the "right" way, but I think this would work
(I'm assuming you want the result to be a data frame):

data.frame(rbind(as.matrix(A),B))

You might get a warning about row names, but I think it works OK.

On 05/03/07, Gregg Lind <lind1199 at 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
>
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-- 
=================================
David Barron
Said Business School
University of Oxford
Park End Street
Oxford OX1 1HP