concatenating dataframes (PR#381)

[maechler@stat.math.ethz.ch]

>>>>> "KH" == Kurt Hornik <hornik@ci.tuwien.ac.at> writes:

>>>>> jlindsey  writes:
    >> The following work if y is an ordinary matrix but not a dataframe:
    >> tt <- NULL y <- data.frame(1:20,1:20) rbind(tt,y)

    >> gives "incompatible types" error (if the dataframe contains only
    >> factor variables, it gives warnings but works)

    >> if I initialize instead with

    >> tt <- list()

    >> it gives a "missing value where logical needed" error.

    KH> I've added a line in rbind.data.frame() which removes all length 0
    KH> arguments.  This solves the problems you describe and passes make
    KH> check, but I am not sure if we really want it ...

I think I agree that we don't want it!

or does the following still work after your fix?

> m0 <- matrix(0,0,3,dimnames=list(NULL,letters[1:3]))
> d0 <- as.data.frame(m0)
> rbind(m0,1)
     a b c
[1,] 1 1 1

> str(d0)
`data.frame':	0 obs. of  3 variables:
 $ a: num 
 $ b: num 
 $ c: num 
> rbind(d0,1)
  a b c
1 1 1 1
> 

Martin

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