# [R] Factors in lattice

Deepayan Sarkar deepayansarkar at yahoo.com
Thu May 16 16:20:25 CEST 2002

```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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```