deg180.m

JLAB is a set of Matlab functions I have written or co-written over the past fifteen years for the p

function[varargout]=deg180(varargin)
%DEG180  Converts degrees from the range [0,360] to [-180,180].
%
%   [TH1,TH2,...THN]=DEG180(TH1,TH2,...THN) converts the range of the
%   input angles, which are measured in degrees, to [-180, 180].
%
%   See also DEG360.
%
%   'deg180 --t' runs a test.
%   __________________________________________________________________
%   This is part of JLAB --- type 'help jlab' for more information
%   (C) 2006 J.M. Lilly --- type 'help jlab_license' for details
 
if strcmp(varargin{1}, '--t')
    deg180_test,return
end
 
varargout=varargin;
for i=1:nargin;
    th=varargin{i};
    index=find(isfinite(th));
    if ~isempty(index)
        if minmin(th(index))<-180 || maxmax(th(index))>360
            error(['Range of TH' int2str(i) ' lies outside [-180,360]'])
        end
    else
        error(['Range of TH' int2str(i) ' lies outside [-180,360]'])
    end
    
    index=find(th>180);
    if ~isempty(index)
        th(index)=th(index)-360;
    end
    varargout{i}=th;
end


function[]=deg180_test
thi=[359 181];
tho=[-1 -179];
reporttest('DEG180 simple',aresame(deg180(thi),tho))