function phi = correct_azimuth(phi)
%CORRECT_AZIMUTH ensures azimuth angle between -pi and +pi-eps 
%
%   Usage: phi = correct_azimuth(phi)
%
%   Input parameters:
%       phi     - azimuth / rad. Can be a single value or a matrix.
%
%   Output paramteres:
%       phi     - angle between -pi and +pi-eps / rad
%
%   See also: correct_elevation, get_ir

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% The MIT License (MIT)                                                      *
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% Copyright (c) 2010-2019 SFS Toolbox Developers                             *
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%% ===== Checking of input  parameters ==================================
nargmin = 1;
nargmax = 1;
narginchk(nargmin,nargmax);


%% ===== Computation ====================================================
% Ensure -2pi <= phi <= 2pi
phi = rem(phi,2*pi);
% Ensure -pi <= phi < pi
phi(phi<-pi) = phi(phi<-pi) + 2*pi;
phi(phi>=pi) = phi(phi>=pi) - 2*pi;
