[Rd] x=.94 (PR#10529)

[Uwe Ligges]

Please do read the R FAQ:
"Why doesn't R think these numbers are equal?"

and before posting, you should have read the R FAQ:
"What is a bug?"

that points you to the former FAQ!

Uwe Ligges





jrecta at gmail.com wrote:
> I am using R Version 2.6.2007-11-23.  I do not know if the problem exists
> for other values or versions
> 
> I encountered a problem when searching for the number 0.94 and 0.95 in a
> vector of values.  I illustrate it below by creating a sequence of values 2
> ways and then looking for the value 0.94 (same result for 0.95).  It looks
> like the vector generated by seq( ) is a bit off:
> 
>> a<-seq(.9,.95,by=.01)
>> a
> [1] 0.90 0.91 0.92 0.93 0.94 0.95
> 
>> b<-c(.90,.91,.92,.93,.94,.95)
>> b
> [1] 0.90 0.91 0.92 0.93 0.94 0.95
> 
>> a==.94
> [1] FALSE FALSE FALSE FALSE FALSE FALSE
>> b==.94
> [1] FALSE FALSE FALSE FALSE  TRUE FALSE
> 
>> a-b
> [1] 0.000000e+00 0.000000e+00 0.000000e+00 0.000000e+00 1.110223e-16
> [6] 1.110223e-16
> 
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> 
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