How to get rid of values from meshgrid

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esat gulhan
esat gulhan 2020-9-21
评论： Ameer Hamza 2020-9-21
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

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Ameer Hamza
Ameer Hamza 2020-9-21
编辑：Ameer Hamza 2020-9-21
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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