You can't mix number and character data in a data frame column, so you will
probably find that all your variables are factors, not numbers. Try, for example
class(Daten$V2)
It looks like you failed to specify 'header=TRUE' in a read.table statement.
Reread the data with headers properly treated so that those first items become
the variable names.
In additon, Daten$V2[Daten$V3=="m"]) will only give you data for rows in which
V3=="m", which will be a single boxplot. (see ?"[" for what that subsetting
operation does). To plot all combinations ( if V2 were correctly numeric) you
could try
boxplot(V2~V1+V3, data=Daten)
S Ellison
________________________________________
From: r-help-boun...@r-project.org [r-help-boun...@r-project.org] On Behalf Of
maggy yan [kiot...@gmail.com]
Sent: 11 May 2013 16:40
To: R-help@r-project.org
Subject: [R] boxplot with grouped variables
my dataset looked like this in the beginning:
>Daten
V1 V2 V3
1 Dosis Gewicht Geschlecht
2 0 6.62 m
3 0 6.65 m
4 0 5.78 m
5 0 5.63 m
I need box plots for V2 with all combination of V1 and V3, so I deleted the
first row, and tried this:
boxplot(Daten$V2[Daten$V3=="m"])
but it does not work and I have no clue what I did wrong.
I'm thankful for any help!
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