R help - Feb 2008 - Hmisc xYplot won't do conditioning on factors?

Hi,

I am trying to replace (lattice) standard xyplot with xYplot variant from 
Hmisc package to be able to add error bars to my plots. However, this does 
not work, e.g:

library(lattice)
d <- data.frame(
	SKU=gl(3, 1, 21, labels=c("a", "b", "c")), 
	Weekday=gl(7, 3, 21), 
	QCRate=runif(21))

xyplot(QCRate ~ Weekday | SKU, data=d)

(this plots nice 3 panels as per a,b,c conditionals)

library(Hmisc)
> xYplot(QCRate ~ Weekday | SKU, data=d)
Error in Summary.factor(1:7, na.rm = TRUE) :
  range not meaningful for factors

Is there a workaround?

Thanks,
Ivan

The information transmitted in this electronic communica...{{dropped:10}}

Hi,

Since nobody replied, I'd rather post this self-reply for the sake of 
documenting the solution.

It appears that xYplot, unlike "standard" xyplot (or coplot to that
matter)
does not accept factors as x variable in formula. With x converted to numeric 
everything worked as expected. This small discrepancy was not documented on 
xYplot help page.

--Ivan


On Tuesday 26 February 2008 07:47:14 pm Ivan Adzhubey
wrote:
> Hi,
>
> I am trying to replace (lattice) standard xyplot with xYplot variant from
> Hmisc package to be able to add error bars to my plots. However, this does
> not work, e.g:
>
> library(lattice)
> d <- data.frame(
> 	SKU=gl(3, 1, 21, labels=c("a", "b", "c")),
> 	Weekday=gl(7, 3, 21),
> 	QCRate=runif(21))
>
> xyplot(QCRate ~ Weekday | SKU, data=d)
>
> (this plots nice 3 panels as per a,b,c conditionals)
>
> library(Hmisc)
>
> > xYplot(QCRate ~ Weekday | SKU, data=d)
>
> Error in Summary.factor(1:7, na.rm = TRUE) :
>   range not meaningful for factors
>
> Is there a workaround?
>
> Thanks,
> Ivan