Hi list

I  need some help for drawing some histograms

I have a dataframe , say,
X Y Z T

I want to draw a histogram Z-T for each value of the couple (X-Y).
When I use thus syntax

> library(lattice)
> histogram(law[,3] ~ law[,66] | law[,1] )

it draws multiple histograms but by selecting distinct values of  law[,1]
The deal is to make the same thing but for a couple of columns

Thanks in advance for help

Adel



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