Hi all, I am trying to plot two pearson correlation coefficient matrices on one heatmap using heatmap.2. I combined two matrices as following A = [0.8 0.9; 0.75 0.95] B = [0.82 0.87 0.94 0.74] combined = [0.8 0.9 0 0; 0.75 0.95 0 0 0 0 0.82 0.87 0 0 0.94 0.74] heatmap.2(combined,distfun=function(c) as.dist(1-c),hclustfun=function(c) hclust(c,method="average"), race="none", col=greenred(75),trace="none",dendrogram ="column") The resultant heatmap having a scale from 0 to 1. I want to ignore the zero elements in the combined matrix and display them in black. Also, I want the scale to be greater than 0.7. I looked at the heatmap.2 webpage, but did not have a clue. Could anybody help me? Thank you in advance. Wendy -- View this message in context: http://r.789695.n4.nabble.com/plot-two-pearson-correlation-matrix-on-one-heatmap-tp3261882p3261882.html Sent from the R help mailing list archive at Nabble.com.