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Hi, i created a graph with heatmap(sma) function: heatmap(dataHeat(x)) and I wish to change the gradation of colors from blue to red, how could i do? Using "heatmap(dataHeat(x), col=c(2,4))" i will use only 2 colors without gradation. Ty so much Andrea

...ot;blue", "red")) heatmap(dataHeat[Top100, ], col=myBlRd(15)) i need to retrieve the row names' list ordered by the dendrogram. I tried with "rownames(data)[Top100]" but the list is not ordered (as i can see in the generated picture). Any tips? Tnx AZ -- Andrea Zangrando - Ph.D. Student University of Padova Department of Pediatrics Laboratory of Pediatric OncoHematology Via Giustiniani, 3 35128 Padova - Italy Phone: +39 049 8211457 Fax: +39 049 8211456 Email: andrea.zangrando at unipd.it