From: Thomas Lumley (tlumley@u.washington.edu)
Date: Sat 09 Mar 2002 - 04:05:16 EST
Message-id: <Pine.A41.4.44.0203080902560.69958-100000@homer34.u.washington.edu>
On Fri, 8 Mar 2002, jimi adams wrote:
> 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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