displaying "half" of a 3d plot

[Peter Schreiber]

Hi guys,
I would like to display only half of a 3d plot to show some details of the functions.
More specificly, I want to make a diagonal cut through the 3d plot, and only display one half.
I could get it to work using plot3, but I really would need to represent a surface.

That's what I came up with so far:

[x,y]=meshgrid(linspace(-1,1,100));
t=triu(ones(size(x)),-1)&ones(size(x));
z=x.^2+y.^2;
plot3(x(t),y(t),z(t),'o')

Is there any chance to really represent the function z as a surface?

Best Regards,
Peter

[Steven Lord]

"Peter Schreiber" <schreibe...@gmail.com> wrote in message
news:hnbrag$e9l$1...@fred.mathworks.com...

Use:

z(~t) = NaN;
surf(x, y, z);

instead of your PLOT call.

Actually, since I believe you can express your condition as a function of x
and y, you don't need to create t. An example that you can adjust to suit
your specific needs:

[x,y]=meshgrid(linspace(-1,1,100));
z=x.^2+y.^2;
z(x < y) = NaN;
surf(x, y, z)

--
Steve Lord
sl...@mathworks.com
comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ