Why print(x, digits=20) does not correctly truncate/round x?

Asked Jun 03 '17 at 10:47

Active Jun 03 '17 at 10:47

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I expect the result of the command below to be 0.54742763380700947 (truncating) or 0.54742763380700948 (rounding).

> print(0.54742763380700947685, digits=20)
[1] 0.54742763380700943

Why is it 0.54742763380700943? Where this "3" at the end comes from?

asked Jun 03 '17 at 10:47

Stéphane Laurent

Strange, where I paste it, I get 0.54742763380700942832 Does it depend on the system (32-bit/64 bit)? – Jan Sila Jun 03 '17 at 10:56
(I'm using 64 bit.) – Stéphane Laurent Jun 03 '17 at 11:02
This is interesting too: typing `options(scipen=999); 0.54742763380700947685*10^20` I get `54742763380700946432` on a 64bit Windows7 PC. – Marco Sandri Jun 03 '17 at 12:12

0 Answers0