[R] Error when producing multiple graphes

From: Uli Kleinwechter <ulikleinwechter_at_yahoo.com.mx>
Date: Tue, 18 Mar 2008 16:20:33 +0100


Dear all,

Within a larger script I use the following code to produce barplots for all variables contained in a dataframe "type3m":

    for(xn in names(type3m)) barplot(table(type3m[[xn]]), main = paste     ("Barplot of", xn), width=0.75,legend.text=barnamesm,     xlim=c(0,4),ylim=c(0,400))

The plots are produced and printed into a *.ps file. However, R gives an error message and aborts the script. The error message is:

    Fehler in rect(as.double(xleft), as.double(ybottom),     as.double(xright), :

            ungültiges erstes Argument

(it's in German. In English, it says something like "Error in rect(as.double(xleft), as.double(ybottom), as.double(xright), : invalid first argument)

It seems to be some problem with the barplot function. The variables in the dataframe are discrete variables taking values from 1 to 4 (hence, the xlim=c(0,4) and the graph is supposed to show the frequency of each value. Maybe the problem is related to the fact that not some variables don't take all of the values, i.e., there are some that don't take the value 1, for example.

I spent quite some time trying to solve the problem, but can't manage it. What's wrong here and how can it be solved?

Thank you very much!

Uli

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