compute the unit vector given the angle

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zhang
zhang 2012-5-4
编辑： Walter Roberson 2018-12-10
Hi guys,
How to compute the unit vector given the direction? Is there any function in matlab to do this task.
Thanks

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回答（3 个）

Walter Roberson
Walter Roberson 2012-5-4
编辑：Walter Roberson 2018-12-10
For angle theta in radians,
%[x, y] = pol2cart(1, theta); %-> incorrect
[x, y] = pol2cart(theta, 1); %repaired
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Kye Taylor
Kye Taylor 2012-5-4
It's unusual that the inputs to the function don't match the "r-theta" convention that is used so often to identify the coordinate space.

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Roger Stafford
Roger Stafford 2016-1-9
If vector 'v' points in the desired direction, then do this to make it a unit vector:
v = v/norm(v);
Kye Taylor
Kye Taylor 2012-5-4
Given the angle
theta
in radians (counter-clockwise is positive theta, theta = 0 points in the positive x-direction) your unit vector is
u = [cos(theta),sin(theta)]

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