plot a surface inside a circle of radius R

I have a matrix T, which represents cornea local thickness. I wan to clean up the borders and plot T inside a circle or radius r ( turn image on the left side onto image on the right side).

Answer 1

[Voss]

You can set the elements of T beyond a certain distance from the origin (i.e., the center of the circle) to NaN so they don't show up.

% first, make a rough approximation to your initial 
% image because I do not have your data:
r = 5.7;
x = -r:0.01:r;
y = -r:0.01:r;
[X,Y] = meshgrid(x,y);
T = (X.^2+Y.^2)/r^2;
surf(X,Y,T,'EdgeColor','none');
view([0 90]);
set(gca(),'CLim',[0.3 1]);
colormap('jet');
colorbar();
xlabel('X');
ylabel('X');
title('Thickness');

% NaNs don't show up in the surface plot, so to make the region outside the
% circle disappear:
T(X.^2+Y.^2 > r^2) = NaN;

% and plot it the same way (but make the axes invisible)
figure();
surf(X,Y,T,'EdgeColor','none');
view([0 90]);
set(gca(),'CLim',[0.3 1],'Visible','off'); % turn off the axes
colormap('jet');
colorbar();

[Elizabeth Diaz Bueno]

This is what I need, Thanks!

My figure isn't as smooth as yours but it'll do. ( I've attached the files, I realized I forgot to do it before)

[Voss]

You're welcome!