How to use curl for 2D-vector field correctly?

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Nima
Nima 2019-8-15
编辑： Andreas Passos 2021-2-25
Hi everyone,
I've some data from a simulation like (x,y,u,v) which u corresponds to velocity in x-direction and v in y-direction. In order to compute the curl of vector V(u,v) i did it like so:
x = data(:,1);
y = data(:,2);
u = data(:,3);
v = data(:,4);
V = [u v];
R = [x y];
curl = curl(V,R);
Now i wanna to see if my code is correct or is there any mistake?
Many thanks!
  1 个评论
Andreas Passos
Andreas Passos 2021-2-25
编辑：Andreas Passos 2021-2-25
I have the exact same question,
'how to calculate the curl of a trajectory'
if you found the answer please let me know

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回答（1 个）

Jess Lovering
Jess Lovering 2019-8-15
I think you might have to make those inputs into matrix format first with meshgrid. Then you can pass those directly into curl.
x = data(:,1);
y = data(:,2);
u = data(:,3);
v = data(:,4);
[X,Y] = meshgrid(x,y);
[U,V] = meshgrid(u,v);
curl = curl(X,Y,U,V);
  2 个评论
Nima
Nima 2019-8-15
If I use meshgrid, then I will receive 0 and NAN as results of curl!
Jess Lovering
Jess Lovering 2019-8-15
Sorry - you are right. I am not sure because the help says it needs to be a matrix "as if produced by meshgrid."

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