apply question

What is wrong with utilizing the vectorized nature of paste?

 zz[[1]] <- paste(zz[[1]],zz[[2]],sep="_")
---------------------------------------------------------------------------
Jeff Newmiller                        The     .....       .....  Go Live...
DCN:<jdnewmil at dcn.davis.ca.us>        Basics: ##.#.       ##.#.  Live Go...
                                      Live:   OO#.. Dead: OO#..  Playing
Research Engineer (Solar/Batteries            O.O#.       #.O#.  with
/Software/Embedded Controllers)               .OO#.       .OO#.  rocks...1k
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Sent from my phone. Please excuse my brevity.

This works, where zz is a dataframe:

for(i in 1:nrow(zz)) {
    zzz[i,1]<-paste(zz[i,1],zz[i,2],sep="_")
    }

I would like to use "apply" to concatentate two columns of text along
with
a separator.
How?

Chet

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