[R] precision issue?

[Berend Hasselman]

Alexander Nervedi wrote:
> 
> 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?
> 

Read th R FAQ.
See 7.31 Why doesn't R think these numbers are equal?

Berend
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