How to put black borders in heatmap in R

Question

Hi I created a heatmap in R using \"heatmap.plus\" which is shown in the link

http://i.stack.imgur.com/hizBf.jpg

but I need the heat map to look like the heatma

Answer 1

Try this:

 library(plotrix)

 #Build a 40 Row by 40 Column Matrix
 n <- 40
 mat <- matrix(rnorm(n*n), nrow = n)

 #Plot it
 color2D.matplot(mat, cellcolors = color.scale(mat, c(0,0.5,1), c(1,0.5,0), 0))