I have a naive question, is it possible to have a density plot from a data set. For e.g., the data set is {i,j,f(i,j)}. Here j is a function of i, that is to say if i=1, j only goes to 6, if i=2 then j goes till 18, so on so forth. However, just to repeat. I have this kind of a data set, is it possible to generate a density plot of the same?