Re: [R] Help with which()

From: Erik Iverson <iverson_at_biostat.wisc.edu>
Date: Thu, 24 Jul 2008 10:35:45 -0500

See

http://cran.r-project.org/doc/FAQ/R-FAQ.html#Why-doesn_0027t-R-think-these-numbers-are-equal_003f

naw3_at_duke.edu wrote:
> Hi,
>
> I'm using which to find the position of a value in my data table, and it is
> returning the correct position and the position of another number that differs
> by an extra decimal place. For example, when I do:
>
> where1<-which(Operons==3573.1,arr.ind=TRUE)

>
> it returns the position of that number and of 3573.15.
>
> Is it possible to get the function to only return a position if the number
> matches exactly?
>
> Thanks,
> -Nina
>
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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Thu 24 Jul 2008 - 15:42:34 GMT

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