Transform angles that are -180 to +180 to angles that are in the 0-360 degree range?

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Kylie Davis 2016-6-1

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https://ww2.mathworks.cn/matlabcentral/answers/286805-transform-angles-that-are-180-to-180-to-angles-that-are-in-the-0-360-degree-range

回答： theodore panagos 2018-12-5

I am implementing a vector coding technique in matlab using the atan2d(diff(y),diff(x)) function, but the results are from -180 to +180 and I would like to have a 0-360 range. I tried to input an if statement for angles < 0 to have 360 added to them, but I couldn't get it to work. It is possible that I just didn't write the statement correctly, but I would appreciate any tips or advice.

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dpb 2016-6-1

"It is possible that I just didn't write the statement correctly, but I would appreciate any tips or advice."

Well, it's a little tough to comment on what we can't see...what did you try?

Kylie Davis 2016-6-1

Sorry about that. I tried: if x < 0 x = x+360 end

But the other difficulty I am having is that I have so many data sets that I need to apply that to. I have hip, knee, and ankle joint angle data for both limbs of 18 subjects. So I need to have an if statement correcting the negative angles for 36 different sets.

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Answer 1

Star Strider 2016-6-1

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https://ww2.mathworks.cn/matlabcentral/answers/286805-transform-angles-that-are-180-to-180-to-angles-that-are-in-the-0-360-degree-range#answer_224127

在 MATLAB Online 中打开

This is my little anonymous function that I use for such problems:

Angles360 = @(a) rem(360+a, 360); % For ‘atan2d’

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Kylie Davis 2016-6-1

I think I got it to work. Thanks so much!

Star Strider 2016-6-1

在 MATLAB Online 中打开

My pleasure!

It’s an anonymous function, and works like any other function. Just put it at the beginning of your code, then call it as:

Angles360 = @(a) rem(360+a, 360);                        % For ‘atan2d’
x = randi(9, 5, 1);                                 % Create Data
y = randi(9, 5, 1);                                 % Create Data
theta = atan2d(diff(y),diff(x));
theta360 = Angles360(theta);

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