pwGetDrivingFunction
df = pwGetDrivingFunction(uType, uTimes, uValues, u2Values) uType: 'steps', 'linear', 'exponential', 'spline', 'injection'
df = pwGetDrivingFunction(uType, uTimes, uValues, u2Values) uType: 'steps', 'linear', 'exponential', 'spline', 'injection'