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

If you follow the tutorial from Learn R blog and change the color in this paragraph to black, you will get:

(p <- ggplot(nba.m, aes(variable, Name)) +
    geom_tile(aes(fill = rescale), colour = "black") +
    scale_fill_gradient(low = "white",high = "steelblue"))