How can I extract orientation of arrows from quiver function?
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In quiver function where is the information about the arrow orientation?
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Sean de Wolski
2015-3-10
编辑:Sean de Wolski
2015-3-10
You'll need to use atan2 to get the orientation from u, v
q = quiver(1,1,1,0.5)
r = atan2(q.VData,q.UData)
r*180/pi to get it into degrees
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Michael Haderlein
2015-3-9
quiver actually plots the information.
quiver(x,y,u,v)
means arrows are drawn pointing in (u/v) direction and positioned at (x/y). So, if you have x=0, y=0, u=1, v=1, you get one arrow pointing top right. For multiple arrows, x, y, u and v have multiple values.
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Michael Haderlein
2015-3-10
I don't get it... The origin is lost in the compass plot, but that's an inherent property of the compass plot and has nothing to do with the orientation. Set all x,y to zero and the arrows will align. Set x,y to their correct values (~=0) and they will shift to their correct position but remain their orientation.
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