Put many heatmap images in one single slide

Question

I have 3 heatmap plots generated using CRAN package heatmap. I want to put these three images in one slide then I used the following command

cowplot::plot_grid(mfs, mfs_ma, mfs_fe,ncol= 3, labels=LETTERS[1:3])

but it return me

Warning messages: In as_grob.default(plot) :Cannot convert object of class pheatmap into a grob

Therefore,how I can put these three images in one slide.

well, I did that already but didn't put them in one slide. It just plots each one by one — adR
– adR, Commented Jun 26, 2020 at 9:35
Can you provide link to the package, and your code to create mfs, mfs_ma, mfs_fe objects — zx8754
– zx8754, Commented Jun 26, 2020 at 10:03

Marco Sandri · Accepted Answer · 2020-06-27 21:33:04Z

4

Your heatmaps mfs, mfs_ma, mfs_fe are pheatmap objects.
Consider the following simple example:

library(pheatmap)
test <- matrix(rnorm(200), 20, 10)
mfs <- mfs_ma <- mfs_fe <- pheatmap(test)

You can arrange the 3 heatmaps into a single plot using:

cowplot::plot_grid(mfs$gtable, mfs_ma$gtable, mfs_fe$gtable,
                   ncol= 3, labels=LETTERS[1:3])

or

gridExtra::grid.arrange(grobs=list(mfs$gtable, mfs_ma$gtable, mfs_fe$gtable), 
                        ncol= 3, labels=LETTERS[1:3])

answered Jun 27, 2020 at 21:26

Marco Sandri

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3 Comments

will this work for complexheatmap objects? where my row dimension are different ,and I want them just like the solution you had given

@PesKchan Interesting question...! Please, post your question on stackoverflow (with a good, simple, reproducible example).

I figured out gb<-grid.grabExpr(draw(H1_high)) this converts the complexheatmap object which can be used for gridplot