Re: [Rd] match() (PR#13135)

From: Prof Brian Ripley <ripley_at_stats.ox.ac.uk>
Date: Sat, 11 Oct 2008 20:24:02 +0100 (BST)

FAQ Q7.31 strikes again!

0.89 is not a member of seq(0.6,1,by=0.01), since 0.01 cannot be represented exactly in a binary computer.

On Tue, 7 Oct 2008, wchen_at_stat.tamu.edu wrote:

> Full_Name: Willa Chen
> Version: 2.7.2
> OS: Window XP
> Submission from: (NULL) (128.122.182.70)
>
>
>
>
> The match function does not return value properly. See an example below.
>
>
>> a<-seq(0.6,1,by=0.01)
>> match(0.88,a)
> [1] 29
>> match(0.89,a)
> [1] NA
>> match(0.90,a)
> [1] NA
>> match(0.91,a)
> [1] NA
>> match(0.92,a)
> [1] NA
>> match(0.93,a)
> [1] NA
>> match(0.94,a)
> [1] 35
>
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>

-- 
Brian D. Ripley,                  ripley_at_stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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