How to get rid of values from meshgrid

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My code is below. I want to get rid of middle values of mesgrid which are very large. Nan maybe.
Is there any way to get rid of midle values (ı do not want see values in the midle of meshgrid ı want to blank [1 1] square from midle of meshgrid)
syms u uo ur v x y Q C r T tt
V=100;b=2;uo=-V*sin(Q);ur=V*2*pi*b/(2.*pi.*r)+V*cos(Q);r=(x.^2+y.^2).^0.5;Q=atan2(y,x);
uo=subs(uo);ur=subs(ur);
%VECTORFIELD
[x,y] = meshgrid(-5:gl:5,-5:gl:5);
u=subs(ur*cos(Q)-uo*sin(Q));v=subs(ur*sin(Q)+uo*cos(Q));
quiver(x,y,u,v,1.01,'r','linewidth',2),grid on

Accepted Answer

Ameer Hamza
Ameer Hamza on 21 Sep 2020
Edited: Ameer Hamza on 21 Sep 2020
Try this
syms u uo ur v x y Q C r T tt
V=100;b=2;uo=-V*sin(Q);ur=V*2*pi*b/(2.*pi.*r)+V*cos(Q);r=(x.^2+y.^2).^0.5;Q=atan2(y,x);
uo=subs(uo);ur=subs(ur);
%VECTORFIELD
gl = 0.11; % to avoid 0 in the meshgrid
[x,y] = meshgrid(-5:gl:5);
u=subs(ur*cos(Q)-uo*sin(Q));v=subs(ur*sin(Q)+uo*cos(Q));
mask = (abs(x) < 1) & (abs(y) < 1);
u(mask) = 0;
v(mask) = 0;
quiver(x,y,u,v,1.01,'r','linewidth',2),grid on

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