How to increase number of contour lines in a plot?
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Hello, could you help me make this plot have 20 controur lines and show their respective values on the plot
f = @(x1,x2) (x1-5)^2+(x2-4)^2;
fcontour(f,[0 10 0 10])
colorbar
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/964430/image.png)
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Steven Lord
le 14 Avr 2022
f = @(x1,x2) (x1-5).^2+(x2-4).^2; % Vectorized the function
h = fcontour(f,[0 10 0 10]); % Let MATLAB choose the number and height of levels
fprintf("There is a contour at level: %g\n", h.LevelList)
figure
h = fcontour(f,[0 10 0 10], 'LevelList', 0:5:50); % I'll choose the levels
fprintf("There is a contour at level: %g\n", h.LevelList)
Bjorn Gustavsson
le 14 Avr 2022
If you check the documentation you will find this advice:
fcontour(f,'LevelList',[-1 0 1])
which adapted to your xy-region would be something like:
fcontour(f,[0 10 0 10],'LevelList',[-1 0 1])
HTH
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Bjorn Gustavsson
le 14 Avr 2022
That is a simple for you to achieve as modifying the levels in the "LevelList". I couldn't be bothered to figure out where to put them since you might want the somewhere else, but for 20 levels between two values you could do something like:
minVal = 0.5; % Still cannot be bothered to find out, so you have do decide.
maxVal = 13; % same as above.
LevelList = linspace(minVal,maxVal,20);
fcontour(f,[0 10 0 10],'LevelList',LevelList)
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