when to use which apply function?

Dear list,

I am a little confused as to when to use apply, sapply, tapply, vapply,
replicate.  I've encountered this several times,
This is time, this is what I am working on,

  mat <- matrix(c(seq(from=1, to=10), rnorm(10)), ncol=2)

  a=1; b=5

newfun <- function(x, y, a, b)

{

  x*y+a+b

}

  sapply(i=1:10, newfun(x=mat[i, 1], y=mat[i, 2], a=a, b=b))

Error in match.fun(FUN) : argument "FUN" is missing, with no default

I want to use ith row of mat, evaluate newfun().  Am I making a parameter
mistake, or should I use a different apply function?


Thanks in a advance,

Mike

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