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
--
PhD candidate in Computer Science
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