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Old   August 10, 2006, 22:52
Default 2D streamline
  #1
Junseok Kim
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I am trying to draw 2D streamline from a vector field with matlab software, but I got spiral shape, which is not right. Is there any way to avoid that.

a=3; n=30;

xt = linspace(-a, a, n); yt = linspace(-a, a, n);

[x,y] = meshgrid(xt, yt);

quiver(x,y,y,-x,5) axis image

hold

h=streamline(stream2(x,y,y,-x,2,0)); set(h, 'Color', 'red');

hold
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Old   August 11, 2006, 06:32
Default Re: 2D streamline
  #2
Arambatzis George
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I run your code and I think every think is OK.

The stream lines seems to be tangent to the vector field. Why do you say that the spiral shape is wrong?
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Old   August 11, 2006, 06:35
Default Re: 2D streamline
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Junseok Kim
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What I expect was a closed circle.

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Old   August 11, 2006, 17:12
Default Re: 2D streamline
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Jonas Holdeman
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Right. Stream lines cannot spiral in 2D unless there is a source or sink. They must close on themselves, or begin and end on a boundary. In this case they must be circles.
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Old   August 13, 2006, 04:37
Default I got it
  #5
Junseok Kim
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I got it by using stream function
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