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I'm trying to plot a heatmap using gplots::heatmap.2() .There are a lot of rows and the dendrogram lines appear to be quite thin compared to the image. I 'm wondering if there is any technique to thicken the dendrogram lines as mentioned in this post for the pheatmap output. Thanks

Joe
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The August
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  • The line `ph$gtable$grobs[[1]]$gp <- gpar(lwd = 5)` sets the line width. It made the lines wide for me. – G5W Sep 21 '19 at 00:28
  • Thanks , but I'm looking for similar functionality in heatmap.2 function and NOT in pheatmap – The August Sep 22 '19 at 14:35

1 Answers1

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Yes, the dendextend package does this easily. We can use its set() function here to achieve the desired effect.

set.seed(123)
dat <- matrix(rnorm(100), nrow = 10)

library(gplots)
library(dendextend)

dd <- set(as.dendrogram(hclust(dist(dat))), "branches_lwd", 3)

heatmap.2(dat, Rowv = dd, Colv = dd)

enter image description here

It's worth looking into all the other cool stuff Dendextend does.

Joe
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