Hello,

I am trying to use "bwplot" to display whisker boxes according to some conditioning factors ("age" has two values 1/2). I get the following messages:

> library(trellis)
> bwplot(dvk95~age|site*season,panel=function(x,y){panel.bwplot(x,y)})
Error in tapply(1:0, structure(list(INDICES = numeric(0)), .Names = "INDICES"),  : 
        arguments must have same length
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: is.na(x) 
4: is.na() applied to non-(list or vector) in: is.na(x) 
5: is.na() applied to non-(list or vector) in: is.na(x) 
6: is.na() applied to non-(list or vector) in: is.na(x)

I suspect this may come from not-anwered (NA) combinations of categories (data are field data on hazel grouse and the sampling is not balanced). Using  "xyplot" however leads to a correct display of data, the "NAs" combinations of categories being simply empty in the panel plot.

Passing na.action = na.omit or similar expressions don't lead to anything (actually every vector used has not any NA values).

Is there a way to get a display with bwplot (and panel.bwplot) in this case?

Thanks in advance for any hint,

Kind regards,

Patrick Giraudoux


University of Franche-Comté
Department of Environmental Biology
EA3184 af. INRA
F-25030 Besançon Cedex

tel.: +33 381 665 745
fax.: +33 381 665 797
http://lbe.univ-fcomte.fr
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