? about sample

i am trying to use the
sample command and have one question about it:
i am getting the error

Error in sample(length(x), size, replace, prob) :
        insufficient positive probabilities

when i use something like:
sample (1:4, prob=c(0,0,1,0))[1]

i was expecting that to return a 3 every time

It sounds like you want to add replace=TRUE, eg

R> sample(1:4,prob=c(0,0,1,0),replace=TRUE)
[1] 3 3 3 3

You were trying to sample four numbers without replacement from a set
effectively containing only one number.  That's what the error message
means.

	-thomas

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