Hi,

Is there a way I can draw an abline on a heatmap? I try the abline function, but don't get the line. My sample code is:
mat <- matrix(sample(1:100,40),nrow=5)
heatmap(mat,col=greenred(75),trace="none",
dendrogram = "column",labCol = NULL)
abline(h=5,v=4)


thanks!


   
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