[R-SIG-Mac] R stats: not recognising 'F' as 'FALSE'

[David R Forrest]

Is F defined as anything unusual?

> F
[1] FALSE
> pt(q=1.12, df=12, lower.tail=F)
[1] 0.1423149
> F<- pi
> pt(q=1.12, df=12, lower.tail=F)
[1] 0.8576851
> F<- FALSE
> pt(q=1.12, df=12, lower.tail=F)
[1] 0.1423149
> 


> On Oct 30, 2015, at 12:30 PM, Liam Shaw <liam.shaw.13 at ucl.ac.uk> wrote:
> 
> A student noticed that passing 'F' for 'FALSE' did not have an effect when
> using functions in the stats base package.
> 
> Example:
> 
>> pt(q=1.12, df=12, lower.tail=TRUE)
> [1] 0.8576851
>> pt(q=1.12, df=12, lower.tail=F)
> [1] 0.8576851
>> pt(q=1.12, df=12, lower.tail=FALSE)
> [1] 0.1423149
> 
> I couldn't replicate the problem. Re-installing and updating R on their
> machine had no effect. Does anybody know what could be causing this?
> 
> sessionInfo():
> R version 3.2.2 (2015-08-14)
> Platform: x86_64-apple-darwin13.4.0 (64-bit)
> Running under: OS X 10.11 (El Capitan)
> 
> locale:
> [1] en_GB.UTF-8/en_GB.UTF-8/en_GB.UTF-8/C/en_GB.UTF-8/en_GB.UTF-8
> 
> attached base packages:
> [1] stats     graphics  grDevices utils     datasets
> [6] methods   base
> 
> loaded via a namespace (and not attached):
> [1] tools_3.2.2
> 
> Stats package:
> Package: stats
> Version: 3.2.2
> Priority: base
> Title: The R Stats Package
> Author: R Core Team and contributors worldwide
> Maintainer: R Core Team <R-core at r-project.org>
> Description: R statistical functions.
> License: Part of R 3.2.2
> Built: R 3.2.2; x86_64-apple-darwin13.4.0
> 
> Liam
> 
> 	[[alternative HTML version deleted]]
> 
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--
Dr. David Forrest
drf at vims.edu
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