[R] foruntes candidate?? WAS:Re: Bug in "is" ?

Charles C. Berry cberry at tajo.ucsd.edu
Fri Sep 26 01:31:28 CEST 2008

Douglas Bates [after a tortuous discussion of the behavior of 

As for the question of the bug in "is", ... "it depends what your 
definition of `is' is." [Bill Clinton]


Good one, Douglas!


On Thu, 25 Sep 2008, Douglas Bates wrote:

> On Thu, Sep 25, 2008 at 4:23 PM, Wacek Kusnierczyk
> <Waclaw.Marcin.Kusnierczyk at idi.ntnu.no> wrote:
>> Rolf Turner wrote:

> As for the question of the bug in "is" - although I hate to sound like
> a politician who was given the nickname "Slick Willie" (see Clinton,
> William J.), "it depends what your definition of `is' is."  The
> definition in R is a function that examines the class of an object and
> reports on whether the object has the given class or is of a class
> that inherits from the given class.  In this case it will give an
> answer based on the class of the computer representation of the
> number, not the mathematical concept of the number.

[rest dleted]

Charles C. Berry                            (858) 534-2098
                                             Dept of Family/Preventive Medicine
E mailto:cberry at tajo.ucsd.edu	            UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/  La Jolla, San Diego 92093-0901

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