MATLAB: 2D contour plot with data in Matlab

Question

Dear Experts,

I have x,y and z data attached in excel sheet. How to plot a 2D contour plot which will look like the attached image. And i want to show shome points like (x,y) = (1.364, 0.129) and (1.42, 0.162) in the contour plot.

Answer 1

Yoiur data are gridded. You only need to reshape your vectors to get the matrices necessary for any contour or 3D plots you want:

[D,S] = xlsread('Book1.xlsx');
[Ux,Ix] = unique(D(:,1));                               % Determine Frame Lengths
dIx = diff(Ix);                                         % Define Frame Length
Xr = reshape(D(:,1), dIx(1), []);                       % Create Matrix From Vector


Yr = reshape(D(:,2), dIx(1), []);                       % Create Matrix From Vector
Zr = reshape(D(:,3), dIx(1), []);                       % Create Matrix From Vector
figure
contourf(Xr,Yr,Zr)
xlabel('X')
ylabel('Y')

producing:

See the documentation on the contourf (link) function for details.

Experiment to get the result you want.