calcStepLengthAsymmetry.m

% This function is part of the NMSM Pipeline, see file for full license.
%
% This function calculates step length asymmetry. Step length asymmetry is
% calculated as the ratio between step lengths, therefore a step length
% asymmetry of 1 represent symmetry. 
%
% (struct, struct) -> (Number)
%


function stepLengthAsymmetry = calcStepLengthAsymmetry(modeledValues, ...
    params)

for i = 1:length(params.contactSurfaces)
    if i == 1
        stepLength(i) = calcStepLength(modeledValues. ...
                groundReactionsLab.forces{i}(:,2), ...
            [modeledValues.bodyLocations.parent{i}(:, 1) ...
            modeledValues.bodyLocations.parent{i+1}(:, 1)]);
    else
        stepLength(i) = calcStepLength(modeledValues. ...
                groundReactionsLab.forces{i}(:,2), ...
            [modeledValues.bodyLocations.parent{i}(:, 1) ...
            modeledValues.bodyLocations.parent{i-1}(:, 1)]);
    end
end
stepLengthAsymmetry = stepLength(1) / stepLength(2);
end