How do I specify the ranges of atan2?

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Fran
Fran 2013-4-12
Hello,
I would like to, based on a vector with points (0,0) and (x,y) where (x,y) is anywhere in the plane, to calculate the angle between that vector and the positive vertical Y-axis.
So, I would like that when the vector matches the positive Y, I get 0 degrees.
AND I would like that it increases when going counterclockwise. AND I would like that I have a range between 0 and 360 degrees, no minus or other values.
How to do this with atan2? I am having problems with it even though it's simple trigonometry. I'm trying to avoid using IF statements and such.
Any help would be appreciated.
Kind Regards,
Francesco

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回答（1 个）

Iman Ansari
Iman Ansari 2013-4-12
编辑：Iman Ansari 2013-4-12
I replaced x and y in atan2d:
[x,y]=meshgrid(1:-0.1:-1);
m = atan2d(x,-y)+180;
mesh(x,y,m)

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