calcExternalMomentsPeriodicity.m

% This function is part of the NMSM Pipeline, see file for full license.
%
% This function calculates the difference between the starting and final
% external moment (ground reaction moments for now) for the specified foot
% and moment. 
%
% (Cell, struct, Array of string) -> (Number)
% 


function externalMomentsPeriodicity = calcExternalMomentsPeriodicity( ...
    groundReactionMoments, contactSurfaces, momentName)
for i = 1:length(contactSurfaces)
    indx = find(strcmp(convertCharsToStrings( ...
        contactSurfaces{i}.momentColumns), momentName));
    if ~isempty(indx)
        externalMomentsPeriodicity = diff(groundReactionMoments{i}(:, indx));
    end
end
end