# Plotting points on a 2D filled contour?

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Max Di Luigi on 9 Nov 2018
Answered: jonas on 9 Nov 2018
I have stored some points (each point formed of two components - x1 & x2 variables) generated from iterations (while loop) in a matrix. How do I plot a particular element (x1i & x2i of a stored point for instance) of that matrix as a point on a 2D filled contour? I do not need to plot all the points, but only a few. Thanks for your help.

jonas on 9 Nov 2018
Not sure I understand the question, but you should be able to do that easily by using contourf and scatter.
For example, let's say you have some xy data (n x 2) and you want to plot certain points on a contourf:
n = 100; n points
ind = [20,40,60,94]; %points to plot
xy = randi([10 20],n,2)
contourf(peaks);hold on
scatter(xy(ind,1),xy(ind,2),[],'k')

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