2D contour plot with data in Matlab
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Manish Kumar
on 11 May 2019
Answered: Star Strider
on 11 May 2019
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.![Screenshot (45).png](https://www.mathworks.com/matlabcentral/answers/uploaded_files/218970/Screenshot%20(45).png)
![Screenshot (45).png](https://www.mathworks.com/matlabcentral/answers/uploaded_files/218970/Screenshot%20(45).png)
Accepted Answer
Star Strider
on 11 May 2019
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:
![2D contour plot with data in Matlab - 2019 05 11.png](https://www.mathworks.com/matlabcentral/answers/uploaded_files/218983/2D%20contour%20plot%20with%20data%20in%20Matlab%20-%202019%2005%2011.png)
Experiment to get the result you want.
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