Plotting nxn matrix as a headmap in Gadfly

Question

Hi I am wondering how to plot a heatmap with Gadfly for a n x n matrix. From what I saw the closest thing is Geom.rect or Geom.rectbin, but I am unable to get it in the format of grid.

using Gadfly: Geom, plot
a = rand(3,3)
plot(x = 1:9, y=1:9,color = a, Geom.rectbin)

Related: https://stackoverflow.com/questions/24598690/julia-plot-matrix-with-gadfly-jl — Ashlin Harris, Oct 14 '22 at 17:01
[The example in the Gadfly docs](http://gadflyjl.org/stable/gallery/geometries/#[Geom.rect](@ref),-[Geom.rectbin](@ref)) might be helpful. — Ashlin Harris, Oct 14 '22 at 17:03

score 3 · Accepted Answer · answered Oct 14 '22 at 17:00

3

One option is to use spy():

using Gadfly
a=rand(9,9);
spy(a)

answered Oct 14 '22 at 17:00

Ashlin Harris

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How would you add a text label inside each rectangle with the value of the element? – Royi Jul 14 '23 at 11:06

Plotting nxn matrix as a headmap in Gadfly

1 Answers1