Dear list, I am generating genes vs samples expression heatmaps using the heatmap.2 function from the gplots library. The heatmap data is centered around zero and varies from approximately -6 to 6. Like the heatmap function, a color scheme needs to be specified, for which I have used greenred(75) so far. The most extreme green and red colors are now assigned to the most extreme values; it is also possible to define a color scheme that assigns the most extreme colors to not the most extreme values, for instance -3 and 3 in my case? Thanks and regards, Roel Verhaak

Roel Verhaak wrote: > Dear list, > > I am generating genes vs samples expression heatmaps using the heatmap.2 > function from the gplots library. The heatmap data is centered around > zero and varies from approximately -6 to 6. > > Like the heatmap function, a color scheme needs to be specified, for > which I have used greenred(75) so far. The most extreme green and red > colors are now assigned to the most extreme values; it is also possible > to define a color scheme that assigns the most extreme colors to not the > most extreme values, for instance -3 and 3 in my case? > Look at the breaks argument: heatmap.2(....,breaks=seq(-3,3,-0.1),col=greenred(59)) Sean