Also, mean(x) will generate NaN's if both Inf and -Inf are in x. E.g.,
> group <- c("A","A","A", "B","B","B", "C","C", "D","D")
> when <- c( 1,2,3, -Inf,4,Inf, NA,5, NaN,6)
> tapply(when, group, mean)
A B C D
2 NaN NA NaN
> tapply(when, group, mean, na.rm=TRUE)
A B C D
2 NaN 5 6
boxplot() tosses out the +-Inf's.
Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com
> -----Original Message-----
> From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On
> Behalf
> Of R. Michael Weylandt
> Sent: Monday, April 02, 2012 6:19 AM
> To: Jhope
> Cc: r-help@r-project.org
> Subject: Re: [R] NaN - trouble fixing NaN
>
> Without seeing data, it's only a guess, but you should pass na.rm =
> TRUE to mean() so it will pass over NaNs in the data :
>
> tapply(HSuccess, Aeventexhumed, mean, na.rm=TRUE)
>
> Cheers,
> Michael
>
> On Sun, Apr 1, 2012 at 7:27 PM, Jhope <jeanwaij...@gmail.com> wrote:
> > Hi R-listers,
> >
> > I am using the package plyr. I am just trying to get the hatching success
> > mean of each nesting event and have typed in the following and received the
> > below results:
> >
> >> tapply(HSuccess, Aeventexhumed, mean)
> > A B C
> > 0.2156265 0.1288559 NaN
> >
> > What can I do about NaN? I should be able to get a result for event C
> > because I was able to make a boxplot graph with this information showing all
> > three nesting events (A, B, and C).
> >
> > Please advise,
> >
> > Jean
> >
> > --
> > View this message in context:
> > http://r.789695.n4.nabble.com/NaN-trouble-fixing-NaN-
> tp4524713p4524713.html
> > Sent from the R help mailing list archive at Nabble.com.
> >
> > ______________________________________________
> > R-help@r-project.org mailing list
> > 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.
>
> ______________________________________________
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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