Angle difference between two bearings

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Shikhar Singh 2021-3-11

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评论： cem polat 2022-1-20

采纳的回答： Basil C.

How do I find the minimum angle difference between two angles A & B, for example:

if A = -175, B = 175 -> difference would be 10

if A = 355, B = 5 -> difference would be 10

if A = 720, B = 360 -> difference would be 0

etc.

All I know is that I have to use the absolute and modulus functions somewhere

Would appreciate any help.

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Basil C. 2021-3-11

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Read about principal angles...

For the 1st case:

A=-175 whose principal angle is 185 degree

A - B = 185 - 175 = 10 degrees

You can similarly solve the for the remaining cases

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Basil C. 2021-3-11

The problem with your code is that it A and B must be in the principal form for the code to work.

To solve your question, A and B need to be converted to the principal angle and then just subtract them

Shikhar Singh 2021-3-11

How would this work for an angle like 1060 then?

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Basil C. 2021-3-12

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编辑：Basil C. 2021-3-12

在 MATLAB Online 中打开

To convert any angle to its principal angle

function y = prin_angle(x)
    y=rem(x,360); % returns the remainder when dividing by 360
    if y<0
        y=y+360;
    end
end

Just pass both angles to above function individually to obtain the principal angle, then subtract the two outputs

Just use the following code and pass both A and B directly:

function y = get_difference(A,B)
    y=rem(B-A,360); % returns the remainder when dividing by 360
    if y<-180
        y=y+360;
    elseif y>180
        y=y-360;
    end
end

P.S.: I have just converted the java code from above into matlab code

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darova 2021-3-13

cem polat 2022-1-20

Use anglediff function in Communications or Robotics toolbox. Since anglediff uses radians, you can use a function like below for the angle diff in degrees:

function result = angdiffdeg(from, to)

result = rad2deg(angdiff(deg2rad(from),deg2rad(to)));

end

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