For some reason `match()` treats `NaN`'s as comparables by default:
> x <- c(1,2,3,NaN,4,5)
> match(x,x)
[1] 1 2 3 4 5 6
which I can override when using `match()` directly:
> match(x,x,incomparables=NaN)
[1] 1 2 3 NA 5 6
but not necessarily when calling a function that uses `match()` internally:
> stats::ecdf(x)(x)
[1] 0.2 0.4 0.6 0.8 0.8 1.0
Obviously there are workarounds for any given scenario, but the bigger
problem is that this behavior causes difficult to discover bugs. For
example, the behavior of stats::ecdf is definitely a bug introduced by it's
use of `match()` (unless you think NaN == 4 is correct).
Is there a good reason that NaN's are treated as comparables by match(), or
his this a bug?
For reference, I'm using R version 3.2.3
-Jason
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