How to use colormap/colorbar for plots

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Fernanda on 20 Oct 2022
Commented: Adam Danz on 21 Oct 2022
Hey everyone, when I plot my matrixs it works but now I want to add some color. I want the colors at each point to depend on the x and y coordinate so x+y. I hope that makes any sense. So the higher that x+y value is for a point the higher the color intensity is.
x = [0.5:2:18] ;
y = [30:10:100] ;
[a,b] = meshgrid(x,y);
plot(a,b,'ko',a, a+b,'ko');
colormap
ans = 256×3
0.2422 0.1504 0.6603 0.2444 0.1534 0.6728 0.2464 0.1569 0.6847 0.2484 0.1607 0.6961 0.2503 0.1648 0.7071 0.2522 0.1689 0.7179 0.2540 0.1732 0.7286 0.2558 0.1773 0.7393 0.2576 0.1814 0.7501 0.2594 0.1854 0.7610
colorbar

Adam Danz on 20 Oct 2022
Edited: Adam Danz on 20 Oct 2022
It sounds like you're looking for
x = [0.5:2:18] ;
y = [30:10:100];
[a,b] = meshgrid(x,y);
c = a(:)+b(:);
scatter(a(:),c,80,c,'filled')
colorbar
Adam Danz on 21 Oct 2022
Plot one, then hold on, then plot the second.

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