[R] Clusters of adjacent bars in barchart()

[Waichler, Scott R]

Can I create a barchart in lattice with clusters of adjacent bars, which is
possible with barplot() when beside=TRUE?  How can I
accomplish the grouping in lattice that is done with
inputting a matrix to barplot()? 

Thanks,
Scott Waichler
Hydrology Group/Environmental Technology Division
Battelle Pacific Northwest National Laboratory
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