Shifting Elements in a Matrix

I have a domain from 0 : 2*pi and corresponding data points.

I need to shift this data so that the range is -pi : pi (by subtracting 2*pi for all values over pi), while keeping the relationships to the datapoints the same.

I've tried just reordering the data putting 0 in the middle, but this effects other calculations.

My best option so far is manually reordering points, but feel like there is a more efficient way.

Thank you!

Answer 1

[Walter Roberson]

If you have Mapping Toolbox then there is https://www.mathworks.com/help/map/ref/wraptopi.html

Otherwise,

mask = data > pi;
data(mask) = data(mask) - 2*pi;