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2011 Mar 02
1
how to delete empty levels from lattice xyplot
...y to use the attached code to produce a cross over plot. There are 13 subjects, 7 of them in for/sal group, and 6 of them in sal/for group. But in xyplot, all the subjects are listed in both subgraphs. Could anyone help me figure out how to get rid of the empty levels? Thanks library(lattice) pef1 <- c(310,310,370,410,250,380,330,370,310,380,290,260,90) pef2 <- c(270,260,300,390,210,350,365,385,400,410,320,340,220) id <- c("1","4","6","7","10","11","14","2","3","5","9",&quot...