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ColSideColors key for heatmap.2 function R

I have gone through the documentation of the heatmap.2() function in the gplots package in R looking for a way to code a color key for the ColSideColors argument. Is this supported? I would like to show which levels are represented by each color on the output plot.

Solution

  • legend function in R can help use to solving this problem.

    The code just looks like this:

    heatmap.2(mydata,ColSideColors=mycolors)
# ploting a heatmap
legend("left", title = "Tissues",legend=c("group1","group2"), 
       fill=c("red","green"), cex=0.8, box.lty=0)
# add a legend in which put your group text in legend, 
# and pass your colors which is used in heatmap.2 to fill.

    You can get help in this tutorial