Level sets of factors are different (panel.superpose)
I investigated why I was getting this error message... Error in Ops.factor(groups[subscripts], vals[1]) : Level sets of factors are different which led me to putting a browser in panel.superpose: Called from: panel.superpose(x, y, subscripts, ...) Browse[1]> vals vals [1] 1 2 3 Levels: 1 2 3 Browse[1]> groups[subscripts] groups[subscripts] [1] 1 2 3 1 2 1 2 3 1 2 3 1 2 3 Levels: 1 2 3 this is the line that would fall over (in a for loop) Browse[1]> id <- (groups[subscripts] == vals[i]) so I investigated... Browse[1]> id <- (groups[subscripts] == vals[1]) id <- (groups[subscripts] == vals[1]) Error in Ops.factor(groups[subscripts], vals[1]) : Level sets of factors are different I've not had this problem before, so I'm guessing that in this case, it had something to do with the fact that level 3 was missing in the second instance. I couldn't see why the logical couldn't work that out so I tried something that is often necessary with lists in Splus (3.4 anyway). I changed the line to id <- as.vector(groups[subscripts]) == as.vector(vals[i]) and it works (at least it doesn't fall over -- I haven't done a thorough check to see if it really is working correctly). Is that what is to be expected? I can't follow why. best
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