How to increase number of contour lines in a plot?

There is a contour at level: 10 There is a contour at level: 20 There is a contour at level: 30 There is a contour at level: 40 There is a contour at level: 50 There is a contour at level: 60

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)

There is a contour at level: 0 There is a contour at level: 5 There is a contour at level: 10 There is a contour at level: 15 There is a contour at level: 20 There is a contour at level: 25 There is a contour at level: 30 There is a contour at level: 35 There is a contour at level: 40 There is a contour at level: 45 There is a contour at level: 50

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Mahmoud Abbas 2022-4-14

Thank you, this works well however i need the number of contour lines to be exactly 20 and the associated values to be shown in the plot. is this possible?

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Answer 2

Bjorn Gustavsson 2022-4-14

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1696540-how-to-increase-number-of-contour-lines-in-a-plot#answer_942800

在 MATLAB Online 中打开

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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Mahmoud Abbas 2022-4-14

I tried it but it didn't work and it showed me one contour line. I want the code to plot exactly 20 contours over the specified interval and show their values on the plot

Bjorn Gustavsson 2022-4-14

在 MATLAB Online 中打开

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)