>>>>> "pd" == peter dalgaard
>>>>> on Thu, 24 Oct 2024 11:00:25 +0200 writes:
pd> This is probably Apple Silicon specific, not OSX per se:
>> sum(rep(1 / 9, 9)) - 1
pd> [1] 0
>> On 23 Oct 2024, at 07:26 , Stevie Pederson
>> <[email protected]> wrote:
>>
>> sum(rep(1 / 9, 9)) - 1 # [1] 2.220446e-16
But indeed, it *is* a bug *always* to assume that double
precision arithmetic is exact be it in R or not
(unless you *know* that all the numbers involved are of the form
<integer> * 2^k ; k in "around" (-1000):1000 )
Martin Maechler
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