Sorry if I am cluttering up this list with too many rank beginner questions. But I *am* a rank beginner, and I am at my wit's end with this one: I have a data frame df, with components x,y,z. This command to make a contour plot with lattice graphics works just fine:
contourplot(z~x*y,data=df,cuts=20)
Then I try
contourplot(z~x*y,data=df,cuts=20,region=T)
And it dies on me with the error: Error in unit(x, default.units) : 'x' and 'units' must have length > 0 I have done maybe a hundred contour plots in this same exact way, and have never seen this error before. And it seems to me that adding the flag region=T should be a benign thing to do. I have no idea what it causing the problem. Anyone see what I'm doing wrong? Thanks! --Sam Cable