How to plot only specific contours in matlab?

Question

Ivan Mich 2022-7-7

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1755480-how-to-plot-only-specific-contours-in-matlab

回答： dpb 2022-7-7

Hello,

I would like to ask about contours plot in matlab. I would like to plot only specific contours of all my data. I have values ranrging from 10 to 10000. I would like to plot only the contousr with va;lues : 10, 100, 500, 1000 and 100000.

I am using these commands

t=importdata('input.txt');
x=t(:,1);
y=t(:,2);
z=t(:,5);
[xi, yi] = meshgrid(...
    linspace(min(x),max(x)),...
    linspace(min(y),max(y)));
zi = griddata(x,y,z, xi,yi,'natural');
figure(1)
contourf(xi,yi,zi,15,'LineStyle','none')
set(gca,'ColorScale','log')
colormap(flipud(hot(50)))

Could you please help me?

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Answer 1

dpb 2022-7-7

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1755480-how-to-plot-only-specific-contours-in-matlab#answer_1002515

Did you not read contourf input syntax descriptions?

The third option down says

contourf(___,levels) specifies the contour lines to display as the last argument in any of the previous syntaxes. ... To draw the contour lines at specific heights, specify levels as a vector of monotonically increasing values. ...

Emphasis added, n levels and one level only options elided for brevity -- dpb