[R] error using boxplot.stats (but boxplot works¿?)

Hugo M.Fernandez Bellon hfdez_zoo at yahoo.es
Sun May 6 10:34:29 CEST 2007


The answer to this may be obvious, but it's got me floored.

I'm unable to get boxplot.stats to work for me!

My session looks something like this:

	> ia=read.table('/tmp/prueba.csv', header=TRUE, sep=",")
	> attach(ia)

	> boxplot.stats(X8weeks~Orden)

	Error in sort (na.last, decreasing, ...) : 
        	argument 1 is not a vector

	In addition: Warning messages:
	1: is.na() applied to non-(list or vector) in: is.na(x) 
	2: is.na() applied to non-(list or vector) in: is.na(x) 
	3: is.na() applied to non-(list or vector) in: FUN(X[[1]], ...) 

	[the error message in R 2.3.1 is slightly different: it says it is not 
	atomic and shows only the 1st two warning messages]

However, boxplot(X8weeks~Orden) prints the boxplot properly (no error messages, data accurately represented).

> is.numeric(X8weeks)=TRUE
> is.factor(Orden)=TRUE
"X8weeks" has no NA's 

So, the question is: how can I access the data used to generate the boxplot (and why does boxplot.stats fail)?


Hugo Fernández

	> sessionInfo()
	R version 2.4.1 (2006-12-18) 
	LC_CTYPE=es_ES.UTF-8 at euro;LC_NUMERIC=C;LC_TIME=es_ES.UTF-8 at euro;
	LC_COLLATE=es_ES.UTF-8 at euro;LC_MONETARY=es_ES.UTF-8 at euro;
	LC_MESSAGES=es_ES.UTF-8 at euro;LC_PAPER=es_ES.UTF-8 at euro;

	attached base packages:
	[1] "stats"     "graphics"  "grDevices" "utils"     "datasets"  "methods"  
	[7] "base"

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