[R] [ggplot2] Densityplot, grouping and NAs

[ONKELINX, Thierry]

Dear Bernd,

If only one variable is causing this problem you could make a subset on
that variable.

data = mydf[!is.na(mydf$g), ]

HTH,

Thierry
------------------------------------------------------------------------
----
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature
and Forest
Cel biometrie, methodologie en kwaliteitszorg / Section biometrics,
methodology and quality assurance
Gaverstraat 4
9500 Geraardsbergen
Belgium 
tel. + 32 54/436 185
Thierry.Onkelinx at inbo.be 
www.inbo.be 

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than asking him to perform a post-mortem examination: he may be able to
say what the experiment died of.
~ Sir Ronald Aylmer Fisher

The plural of anecdote is not data.
~ Roger Brinner

The combination of some data and an aching desire for an answer does not
ensure that a reasonable answer can be extracted from a given body of
data.
~ John Tukey

-----Oorspronkelijk bericht-----
Van: Bernd Weiss [mailto:bernd.weiss at uni-koeln.de] 
Verzonden: woensdag 25 maart 2009 11:10
Aan: ONKELINX, Thierry; r-help at r-project.org
Onderwerp: Re: [R] [ggplot2] Densityplot, grouping and NAs

ONKELINX, Thierry schrieb:
> Dear Bernd,
> 
> Omitting the NA values from the dataset will work.
> 
> ggplot(aes(x = x, color = g), data = na.omit(mydf)) + geom_density() 

Dear Thierry,

thanks for your reply! Of course, regarding my little toy example 
na.omit() perfectly works. However, my real data set consists of 
hundreds of variables. So, one has to write

... data = na.omit(myHugeDataset[,c("var1","var99","var208")]) ...

Bernd



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