Predicting Mortality of ICU Patients: The PhysioNet/Computing in Cardiology Challenge 2012 1.0.0

function y = f_vardiff(name,record)

%Get the value of parameter name at times time
[~,values]=getTimeSeries(name, record);
%Compute the feature value

if length(values)<=1,
    y=NaN;
else
    y=var(diff(values));
end