Displaying 1 result from an estimated 1 matches for "tp1577815p1577903".
2010 Mar 04
2
precision issue?
Hi R Gurus,
I am trying to figure out what is going on here.
> a <- 68.08
> b <- a-1.55
> a-b
[1] 1.55
> a-b == 1.55
[1] FALSE
> round(a-b,2) == 1.55
[1] TRUE
> round(a-b,15) == 1.55
[1] FALSE
Why should (a - b) == 1.55 fail when in fact b has been defined to be a - 1.55? Is this a precision issue? How do i correct this?
Alex