Color key in heatmap.2 function in R

Question

[manjumoorthy95]

The below image shows the type of the heatmap i want. As you can see the color key range in the heatmap is -3,3,9,15. How to achieve the same?

I have tried the break argument in the heatmap.2() function. But the color range keeps changing from what ever break i provide. I need the exact numbers in the color key as seen in the picture.

Answer 1

[Ram]

Consider switching to ComplexHeatmap. It eliminates a lot of the problems one faces with heatmap.2 or pheatmap or any of those complicated heatmap building packages.

[manjumoorthy95]

Even in ComplexHeatmap package, when I use the

colorRamp2(c(-3,3,9,15), c(“red”,”yellow”,”green”,”blue”))

The color range is still getting divided in the heatmap automatically to 15,10,5,0,-5. I basically want to see only the values (-3,3,9,15) in the color range bar.

[Ram]

You may want to look at advanced parameters or limit the data range to your specific range by trimming all values that fall outside the range.