[R] Factors in lattice

[Deepayan Sarkar]

It would help to have a reproducible example, since your statement 
is not true in general. For example,

> x <- rnorm(100)
> a <- gl(2, 50)
> b <- gl(3, 1, 100)
> densityplot(~ x | a * b)

seems to work fine for me. A traceback() [first few lines] might also 
help. (The error message is probably not from lattice, but from 
something it calls.)


--- Phil <P.Atkinson at cdsc.nthames.nhs.uk> wrote:
> 
> Using one numeric and 2 factor variables
> 
> densityplot( ~ Numeric | Factor1, ...)
> densityplot( ~ Numeric | Factor2, ...)
> 
>  .. both work, but
> 
> densityplot( ~ Numeric | Factor1*Factor2, ...)
> 
> produces the error
> 
> Error in if (!(lo <- min(hi, IQR(x)/1.34))) (lo <- hi) || (lo <- abs(x[1]))
> ||  : 
>         missing value where logical needed
> 
> None of the variables contain missing values. Any ideas what I'm doing
> wrong??!!
> 
> Many thanks
> 
> Phil.
> 
>
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