RECTANGLE using MESHGRID in MATLAB

I am interested in creating a square/rectangle using meshgrid in MATLAB. Can someone assist me with this?

Thanks in advance

Answer 1

[Youssef Khmou]

hi, try :

 x=0:0.01:1; % 1 meter
 y=x; %  square then .
 [X,Y]=meshgrid(x,y);
 Z=X*Y; % square table
 figure, surf(Z), shading interp

Answer 2

[Image Analyst]

Why using meshgrid, rather than just regular assigning by indexes, which is a heck of a lot easier and simpler to understand?

grayImage = 128*ones(240,320, 'uint8');
grayImage(20:50, 120:150) = uint8(200);
imshow(grayImage);
axis on;