Marc Vandemeulebroecke wrote:

Dear R programmers,

is there a sensible explanation for the following behaviour? The second
command seems not to be interpreted correctly.


seq(0.6, 0.9, by=0.1) == 0.8

[1] FALSE FALSE TRUE FALSE


seq(0.7, 0.9, by=0.1) == 0.8

[1] FALSE FALSE FALSE


c(0.7, 0.8, 0.9) == 0.8

[1] FALSE TRUE FALSE


seq(0.9, 0.7, by=-0.1) == 0.8

[1] FALSE TRUE FALSE


I am running R version 1.7.1 on XP and NT.

Thanks,
Marc

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It is correct, just an instability of the representation of that floating point number, because (regularly) floating point numbers cannot be represented exactly.

Uwe Ligges

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