Hi everybody! I am a beginner in R, and I want to do a barchart with my data. This is the way it looks like (it is a data.frame, but it can a matrix as well): 1 2 3 1 Up Down Up 2 Up Up Up 3 NC Up NC 4 Down NC Down 5 Down NC Up 6 Down Down Down I want to get something like this: _ 1000 | |U| 900 | |_| 800 | |D| . | |_| . | |N| . | |C| 0 |_| |_ _ _ _ _ _ _ _ _ _ 1 2 3 I have tried this: > barplot(a, width = 1, space = NULL, + names.arg = colnames, beside = FALSE) Error en barplot.default(a, width = 1, space = NULL, names.arg = colnames, : incorrect number of names Adem?s: Warning messages: 1: NAs introducidos por coerci?n 2: NAs introducidos por coerci?n 3: NAs introducidos por coerci?n > barplot(a, width = 1, space = NULL, beside = FALSE) Warning messages: 1: NAs introducidos por coerci?n 2: NAs introducidos por coerci?n 3: NAs introducidos por coerci?n I will apreciate if you can help me. Regards, Carol ---------------------------------------------------------------- Este mensaje fue enviado desde el servidor Webmail del Instituto de Biotecnologia.