Error using Quiver function
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Hi, I am having an error using Quiver. Below is my code.
[X,Y] = meshgrid(-1:0.1:1, -1:0.1:1);
k=2*pi;
syms U_inf Lambda Psi X Y u v
Psi = U_inf*Y+((Lambda/k)*atan(Y/X));
u = diff(Psi,Y);
v = diff (Psi, X);
quiver (X,Y,u,v)
The error is "Unable to convert expression into double array."
I believe I am not using the syms correctly. Any help is appreciated!
回答（1 个）
KSSV
2020-9-19
You cannot use like that. You need to take all data in double i.e in numbers to plot the arrows.Something like below:
[X,Y] = meshgrid(-1:0.1:1, -1:0.1:1);
k=2*pi;
U_inf = rand ; % define your value
Lambda = 1. ; %define your value
Psi = U_inf*Y+((Lambda/k)*atan(Y./X));
u = gradient(Psi);
v = gradient(Psi);
quiver (X,Y,u,v)
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2020-9-19
2020-9-19
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