[R] lattice: levelplot() documentation

[Cyril Humbert]

In R-1.5.0, in levelplot() documentation, the argumement `data'
isn't mentioned (it is detailled in xyplot() though):

     levelplot(formula,
                    at,
		    col.regions = trellis.par.get("regions")$col,
		    colorkey = region,
      [../..]						  

It would perhaps be clearer to also add the `data' argument because 
it is implicitly used in the first example:

	 [../..]
	 levelplot(z~x*y, grid, cuts = 50, xlab="", [../..] 
                          ^^^^
-- 
Cyril Humbert
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