Extracting closed contours of streamfunction

2021 11 24
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更新时间：2021 11 25
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I have 2D streamfunction(x,y). I would like to know how can I extract closed contour of streamfunction only without providing threshold. And obtain the rough radius of the circle with centre
Thanking you

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KSSV
KSSV 2021-11-24

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CODER
CODER 2021-11-24
编辑：CODER 2021-11-24
Yes, but this is a way to plot streamlines , however, not extraction of closed contour.
KSSV
KSSV 2021-11-24
Plot the function and use contour. Read about contour.
CODER
CODER 2021-11-24
OK, that's doable but any idea/crtiteria to be used for extracting the closed contour boundary without threshold ?!.
Thanking you
KSSV
KSSV 2021-11-24
Get the points of the contour and try this: https://in.mathworks.com/matlabcentral/answers/583547-set-of-points-form-a-polygon
Or share your data and what have you tried.
KSSV
KSSV 2021-11-24
You have any specific line/ region to extract?
CODER
CODER 2021-11-24
编辑：CODER 2021-11-25
Yes I would like to extract only those circular streamfunction contour which are indicated. Basically it will be having three circular contours only and the contours which are not circular should be removed.Applying theshold would produce contour that are not circular so I avoid threshold.

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CODER
CODER
2021-11-24

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CODER
CODER
2021-11-25

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