How can I modify my code below to plot contour levels with a for loop?

Question

The code below plots multiple contour maps at different locations on the Z axis specified by Zlevel. However, I have more than one Z data points of interest, hence I would like to use a for loop.

Zlevel=[0 1];

figure(1)
hold on 
[~,h1]=contourf(xx,yy,zz(:,:,1)); h1.ContourZLevel=Zlevel(1);
hold on 
[~,hh1]=contour(xx,yy,yy); hh1.ContourZLevel=h1.ContourZLevel;  
hold on 
[~,h2]=contourf(xx,yy,zz(:,:,2)); h2.ContourZLevel=Zlevel(2);
hold on 
[~,hh2]=contour(xx,yy,yy);hh2.ContourZLevel=h2.ContourZLevel;
hold off

I was thinking I could have something like this:

figure(1); hold on;
for i=1:length(Zlevel)
    [~,h(i)]=contourf(xx,yy,zz(:,:,i)); h(i).ContourZLevel=Zlevel(i); 
    hold on
    [~,hh(i)]=contour(xx,yy,yy); hh(i).ContourZLevel=Zlevel(i);
    hold on 
end
hold off

I have tried it and I can't make it work. I am probably not understanding matlab's object handling. So if someone could help me out and explain to me why I can't do what I am trying to do and point me in the right direction, I would really appreciate it!

Thanks!

What is not working? Is the result not what you expected? Do you get an error? Can you [edit] your question and elaborate on how you would like the plot to look like, and what is not working as you'd like. '_I am probably not understanding matlab's object handling._' You should be able to put the graphic handles in an array, and set the properties like you are doing, so that may not be the issue. — rinkert, Dec 08 '19 at 20:45

score 0 · Accepted Answer · answered Dec 09 '19 at 12:18

I don't understand very well why you need 2 calls to contourf per plot, as the secodn should only create some bad lines on your image....

Is this what you want?

% dummy data
[xx,yy,zz] = peaks;
zz(:,:,2)=-zz(:,:,1);
zz(:,:,3)=-2*zz(:,:,1);
zz(:,:,4)=2*zz(:,:,1);



Zlevel=[0 0.25 0.5 1];

figure(1)
hold on
for ii=1:length(Zlevel)
    [~,h(ii)]=contourf(xx,yy,zz(:,:,ii)); h(ii).ContourZLevel=Zlevel(ii);

end
view(3)

How can I modify my code below to plot contour levels with a for loop?

1 Answers1