streamline function gives empty output

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Tong Bo
Tong Bo 2022-9-23
回答： KSSV 2022-9-23
Hi, I am trying to get the streamlines using
verts=stream2(x,y,u,v,startX,startY)
but the output is always empty. Then I tried
quiver(x,y,u,v)
and this plots the velocity field nicely. I also
plot(startX,startY)
and the line is exactly where I want to plot the streamline. I am confused why I got an empty output with stream2. The variables x, y are not meshgrids, and I am not sure if this is becomes a problem for streamline calculation. Does anyone meet a similar problem before? Thanks.
  2 个评论
KSSV
KSSV 2022-9-23
Attach your data....If it is empty that means, there is not streamline starting from the side you have mentioned.
Tong Bo
Tong Bo 2022-9-23
Data attached. There is velocity data where I wanted to plot the streamline. I guess the non-meshgrid is the problem.

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回答（1 个）

KSSV
KSSV 2022-9-23
Try replacing NaN's in u, v with zero and use stream2.

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