I tried:
library(lattice)
F0 <- c( 'A', 'A', 'B', 'B' )
F1 <- c( 1 , 1 , 1 , 2 )
F2 <- c( 8 , 9 , 8 , 9 )
VAL <- c( 20, 50, 10, 60 )
df <- data.frame( F0, F1, F2, VAL )
levelplot( VAL ~ F1 * F2 | F0, data=df )
I got an empty field for F0 == 'A'
and a colored field for F0 == 'B'.
I expected two colored fields. - What can I do?
Thanks. Wolfram
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