Plotting zero vectors in quiver3

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David Meixell
David Meixell 2020-12-3
评论： KSSV 2020-12-3
I'm trying to plot the curl of the function v = -y + x + 0. This comes to (0,0,2), but I get an error stating the variables must be the same size, so I suspect the zeros are causing issues. How can I do a quiver3 plot with these numbers?
%% set up mesh
Xvc=(-5:2:5)';
Yvc=(-5:2:5)';
Zvc=(-5:2:5)';
[X,Y,Z]=meshgrid(Xvc, Yvc, Zvc);
%% plot V
Vx=-Y; % Ex 2 Vx from worksheet
Vy=X; % Ex 2 Vy from worksheet
Vz=0; % Ex 2 Vz from worksheet
figure(110)
quiver3(X, Y, Z, Vx, Vy, Vz); %Changed to 2D plot due to lack of Vz values
grid on
xlabel('Vx')
ylabel('Vy')
%% compute curl
Crlx=0; %Curl X from solved worksheet
Crly=0; %Curl Y from solved worksheet
Crlz=2; %Curl Z from solved worksheet
figure(120)
quiver(X, Y, Z, Crlx, Crly, Crlz);
grid on
tmp=0;

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采纳的回答

KSSV
KSSV 2020-12-3
编辑：KSSV 2020-12-3
Ran in:
%% set up mesh
Xvc=(-5:2:5)';
Yvc=(-5:2:5)';
Zvc=(-5:2:5)';
[X,Y,Z]=meshgrid(Xvc, Yvc, Zvc);
%% plot V
Vx=-Y; % Ex 2 Vx from worksheet
Vy=X; % Ex 2 Vy from worksheet
Vz=zeros(size(X)); % Ex 2 Vz from worksheet
figure
quiver3(X, Y, Z, Vx, Vy, Vz); %Changed to 2D plot due to lack of Vz values
view(3)
grid on
xlabel('Vx')
ylabel('Vy')
●
  2 个评论
David Meixell
David Meixell 2020-12-3
Ah! So for the second part, if I change it to the following, it should work as well?
%% compute curl
Crlx=zeros(size(X)); %Curl X from solved worksheet = 0
Crly=zeros(size(X)); %Curl Y from solved worksheet = 0
Crlz=2*ones(size(X)); %Curl Z from solved worksheet = 2

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