Hi I am very new to R. I am using lattice package to create levelplot. Original code has levelplot(cor.Cars93[ord, ord], xlab = NULL, ylab = NULL) where cor.Cars93 is 18x18 double matrix containing correlation between variables, and ord is just order of variables. However my data looks like Var1 Var2 Median 1 1 0.00 1 2 0.50 1 3 0.90 2 1 2 2 Median value should replace correlation value but it's not in double matrix format. It's not correlation so I can't just create correlation matrix. I tried to search how to create double matrix using my data but no success. Sorry if this is simple question but I just can't seem to find the answer. Thank you -- View this message in context: http://r.789695.n4.nabble.com/Lattice-Levelplot-data-question-tp4457112p4457112.html Sent from the R help mailing list archive at Nabble.com.