Re: Speeding up a for loop

["Richard M. Heiberger" <rmh@temple.edu>]

I think what you need can be constructed with this as the model

A <- data.frame(names=LETTERS, b=sample(1:26))
B <- data.frame(names=c("B","W","M"), value=c(31,32,33))

A[match(B$names, A$names), "b"] <- B$value


Rich