How to use colormap/colorbar for plots

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

Answer 1

[Adam Danz]

It sounds like you're looking for

scatter(x,y,sz,c)

x = [0.5:2:18] ;
y = [30:10:100];
[a,b] = meshgrid(x,y);
c = a(:)+b(:);
scatter(a(:),c,80,c,'filled')
colorbar

[Fernanda]

I also want to plot a and a+b on the same graph, how should I do that?

[Adam Danz]

Plot one, then hold on, then plot the second.