R help - Feb 2009 - Using panel.grid in barchart

Hi all,

I'm trying to do an example in Deepayan Sarkar's Lattice book.  It  
involves making a barchart based on the Titanic dataset.  I can get  
the barchart to plot fine; however, when I try to edit panel.grid, I  
get an error:

 > titan<-barchart(Class ~ Freq | Age + Sex, data =  
as.data.frame(Titanic), groups=Survived, stack=TRUE, layout=c(4,1),  
auto.key=list(title="Survived", columns=2),
scales=list(x="free"))
 > titan     <--- this plot is fine
 > update(titan, panel = function(...) { panel.barchart(...)})  <--- 
same thing; also fine
 > update(titan, panel = function(...) { panel.grid(h = 0,v = -1)  
panel.barchart(...)})
Error: syntax error

Any advice?  I'm using R 2.8.1 on OS X Leopard if it helps.

Thanks,
Chris Jones
c_jones at mit.edu

Christopher Jones <c_jones <at> MIT.EDU> writes:
> I'm trying to do an example in Deepayan Sarkar's Lattice book.  It
> involves making a barchart based on the Titanic dataset.  I can get  
> the barchart to plot fine; however, when I try to edit panel.grid, I  
> get an error:
> 
>  > titan<-barchart(Class ~ Freq | Age + Sex, data =  
> as.data.frame(Titanic), groups=Survived, stack=TRUE, layout=c(4,1),  
> auto.key=list(title="Survived", columns=2),
scales=list(x="free"))
>  > titan     <--- this plot is fine
>  > update(titan, panel = function(...) { panel.barchart(...)})  <--- 
> same thing; also fine
>  > update(titan, panel = function(...) { panel.grid(h = 0,v = -1)  
> panel.barchart(...)})
> Error: syntax error
> 
update(titan, 
  panel = function(...) 
  { 
    panel.grid(h = 0,v = -1)  
    panel.barchart(...)
  }
  )


works for me (even if I always would feel unsecure about using ... only).

Dieter

On Feb 7, 2009, at 8:05 PM, Christopher Jones wrote:
> Hi all,
>
> I'm trying to do an example in Deepayan Sarkar's Lattice book.  It
> involves making a barchart based on the Titanic dataset.  I can get  
> the barchart to plot fine; however, when I try to edit panel.grid, I  
> get an error:
>
> > titan<-barchart(Class ~ Freq | Age + Sex, data =  
> as.data.frame(Titanic), groups=Survived, stack=TRUE, layout=c(4,1),  
> auto.key=list(title="Survived", columns=2),
scales=list(x="free"))
> > titan     <--- this plot is fine
> > update(titan, panel = function(...) { panel.barchart(...)})  <--- 
> same thing; also fine
> > update(titan, panel = function(...) { panel.grid(h = 0,v = -1)  
> panel.barchart(...)})
Scanning that line makes me wonder if you are forgetting to separate  
the individual panel calls with the appropriate separator (";").
>
> Error: syntax error
>
> Any advice?  I'm using R 2.8.1 on OS X Leopard if it helps.
My advice would be to spend a bit more time articulating your goals.

-- 
David Winsemius
>
>
> Thanks,
> Chris Jones
> c_jones at mit.edu
>
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