I'm sure I'm missing something obvious but I'm not seeing how to simply
"vectorize" a function of two or more variables.

Say I have
f <- function(x,y) if (x>0) y else -y

Now I have vectors x and y of equal length and I'd like to apply f
element-wise. I.e. conceptually
 z <- f(x,y) where x, y, z are vectors of the same length

Some magic involving apply? 

Thanks
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