How to plot only specific contours in matlab?

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Ivan Mich
Ivan Mich 2022-7-7
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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dpb
dpb 2022-7-7
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

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