Float is float! [Software]

posted by Helmut Homepage – Vienna, Austria, 2020-12-20 22:27 (34 d 14:28 ago) – Posting: # 22151
Views: 630

Hi PharmCat,

» I think in R it can be done...

At least consistently giving not zero. ;-)

library(Rmpfr)
prec <- 64
x <- mpfr(0.5, prec) - mpfr(0.4, prec) - mpfr(0.1, prec)
x
1 'mpfr' number of precision  64   bits
[1] -2.77555756156289135106e-17

y <- mpfr(-0.4, prec) - mpfr(0.1, prec) + mpfr(0.5, prec)
y
1 'mpfr' number of precision  64   bits
[1] -2.77555756156289135106e-17


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