Why do I get negative values when using circular_mean?

Carla van der Merwe

2018 4 12

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I have an array 99x105. I want to work out the mean (dim 2).

This is what I have:

radxx=deg2rad(xx);
mxx=circ_mean(radxx,[],2);
mean_xx=radtodeg(mxx);

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Walter Roberson 2018-4-13

Carla van der Merwe 2018-4-13

yes

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Walter Roberson 2018-4-13

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Why not?

Round-off error can give negatives, for one thing.

angle() is used to get the angle. You can see from https://www.mathworks.com/help/matlab/ref/angle.html that it can return negative values. It is defined in terms of atan2(), which can give negative values. Everything between (pi, 2*pi) exclusive gives negative values.