controlling the spread of contour lines

Question

ANOSH PHIROZ AMARIA 2018-11-9

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/428972-controlling-the-spread-of-contour-lines

编辑： Image Analyst 2018-11-9

I have the following code which plots a filled contour. I want more closed contours towards the center of the figure because they are more important to me. How can I control the spacing of the contour lines?

% Function to plot contours
x1=-5:0.1:5;
x2=-5:0.1:5;
[a ,b]=meshgrid(x1,x2);
f=(2.*(a).^2)-(1.05.*(a).^4)+((a.^6)./6)+(a.*b)+(b.^2);
[c,h]=contourf(a,b,f,20);
clabel(c,h);

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Answer 1

Star Strider 2018-11-9

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https://ww2.mathworks.cn/matlabcentral/answers/428972-controlling-the-spread-of-contour-lines#answer_346092

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You can define the contour levels with a vector.

Example —

% Function to plot contours
x1=-5:0.1:5;
x2=-5:0.1:5;
[a ,b]=meshgrid(x1,x2);
f=(2.*(a).^2)-(1.05.*(a).^4)+((a.^6)./6)+(a.*b)+(b.^2);
lvls = exp(-10:0.1:7.5);                                    % Define Contour Levels
[c,h]=contourf(a,b,f,lvls);
clabel(c,h);