Why do I get negative values when using circular_mean?

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);

[Walter Roberson]

Is this related to https://www.mathworks.com/matlabcentral/fileexchange/10676-circular-statistics-toolbox--directional-statistics-

[Carla van der Merwe]

yes

Answer 1

[Walter Roberson]

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.