I've cc'd this to the package maintainer, Andy Liaw
<andy_l...@merck.com>. I'm not sure he reads this list.
Duncan Murdoch
On 2024-10-23 1:26 a.m., Stevie Pederson wrote:
Hi,
It appears there is an OSX-specific bug in the function
`randomForest.default()` Going by the source code at
https://github.com/cran/randomForest/blob/master/R/randomForest.default.R
the bug is on line 103
If the vector `cutoff` is formed using `cutoff <- rep(1/9, 9)` (line #101)
the test on line 103 will fail on OSX as the sum is greater than 1 due to
machine precision errors.
sum(rep(1 / 9, 9)) - 1
# [1] 2.220446e-16
This will actually occur for a scenario when the number of factor levels
(nclass) is 9, 11, 18, 20 etc.The problem does not occur on Linux, and I
haven't tested on WIndows.
A suggestion may be to change the opening test
if (sum(cutoff) > 1 || ...)
to
if (sum(cutoff) - 1 > .Machine$double.eps || ...
however, I'm sure there's a more elegant way to do this
Thanks in advance
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