[R] rbind with missing columns

[klaus.thul@infineon.com]

Hello,

I have several data sets, which I want to combine column-by-column using
"rbind" (the data sets have ~100 columns). The problem is, that in some
data sets some of the columns are missing.

Simply using rbind gives me:
"Error in match.names(clabs, names(xi)) : names don't match previous
names"

Is there a simple way to make R do the rbind despite the missing columns
and to fill out the missing data with NA's? (I could program this
somehow, but probably there is one very simple solution available)

To make it clear here a simplified example. "unknown.command" is what I
am looking for.

A <- data.frame(a = c(1,2,3), b = c(4,5,6))
B <- data.frame(a = c(1,2,3))
unknown.command(A, B) - should give

A B
1 4
2 5
3 6
4 NA
5 NA
6 NA

Thank you for your help
Klaus