R help - Jan 2004 - bwplot and panel.bwplot

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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On Friday 02 January 2004 14:29, Patrick Giraudoux
wrote:
> 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)
I'm not aware of any such package, but I'll assume you are talking about
something else.
> > bwplot(dvk95~age|site*season,panel=function(x,y){panel.bwplot(x,y)})
Why are you explicitly specifying a panel function ? Doesn't the default 
work ?
> 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,
Difficult to guess without access to the data. Could you send me (offlist) 
your data frame (preferably saved using 'save') along with actual code
that
reproduces the error ?

Deepayan