f(x,y)<=0

How can I plot this function in 3D-Oxyz? Can somebody give me some advices? Thanks

Answer 1

[KSSV]

It depends on what your function f is. Your function f will show some relation between x and y. Also you should define range of x and y. Checl the below demo example.

% DEfine x, y 
x = linspace(-1,1) ; 
y = linspace(-1,1) ; 
% Make a grid 
[X,Y] = meshgrid(x,y) ; 
% define the function 
f = X+Y ; 
z = NaN(size(f)) ; 
z(f<=0) = f(f<=0) ; % make other value NaN 
surf(X,Y,z)  % plot 
shading interp 
colorbar

[Nguyen Phuoc]

thank you very much

[KSSV]

Thanks is accepting the answer...