How to plot a matrix as an image (greyscale)

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1

Hi guys, my question is how to plot a matrix as an image in greyscale?

I saw the version with ‘Gadfly’ and worked for me but it was in bluescale.

Thank you very much in advance for your support.

Cheers.

Ergnoor

2

With Plots, e.g., you’d do

using Colors, Plots
plot(Gray.(mymatrix))

or

using Plots
heatmap(mymatrix, color = :greys) #which will also give you a color legend

Most plotting packages should do something similar

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3

@mkborregaard Hi Michael and thank you very much. Cheers. Ergnoor

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4

Just for completeness… in Gaston you can do:

using Gaston
M = [ 1 2 3 ; 3 2 1; 4 8 2];
set(palette="gray")
imagesc(M)
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5

Here you assume that mymatrix has values between 0 and 1?