[R] Factors and NaN

[David Winsemius]

On Dec 5, 2014, at 7:16 AM, Dinesh Chowdhary wrote:

> R-3.1.2
> 
>> x <- factor(c("yes", "yes", "no", NA, "yes", "no", NaN))
>> x
> [1] yes  yes  no   <NA> yes  no   NaN
> Levels: NaN no yes
>> is.nan(x)
> [1] FALSE FALSE FALSE FALSE FALSE FALSE FALSE
> 
>> From the above snippet can you notice that the "NaN" value is not logically
> identified in a vector? Can anyone elaborate on this?

It gets converted to a character value. (As always... Read the help page.)

> x <- factor(c("yes", "yes", "no", NA, "yes", "no", NaN), exclude=c(NA,NaN) )
> x
[1] yes  yes  no   <NA> yes  no   <NA>
Levels: no yes

> 
> Thank you for your effort!
> 
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> 
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David Winsemius
Alameda, CA, USA