On 06/09/2012 2:09 PM, Shayne Hodge wrote:
Hello,
(Apologies for length, wanted to get all the relevant detail in that I know
of).
I've been having a lot of trouble with some code for an inventory analysis
problem I was doing, and finally came to the conclusion that it appears
that choose() is returning incorrect values. Specifically:
-------------
Browse[1]> nn
[1] 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3
Browse[1]> Q1
[1] 3
Browse[1]> choose(Q1,3)
[1] 0
That's easy to reproduce, with correct behaviour:
> Q1 <- 3 - 1e-10
> Q1
[1] 3
> choose(Q1, 3)
[1] 0
My guess is your code (which is tl;dr) computes Q1 with some rounding
error, and you're seeing something like this.
Duncan Murdoch
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