Second Derivative of a Signal
 Second_Derivative | |
| /Signal_Types= | The type of signal to be processed |
| /Signal_Names= | The names of the signals to be processed |
| /Signal_Folder= | The name of the signal folder |
Compute the second derivative at each point of a signal. The first and last data points become DATA_NOT_FOUND(identified in the C3D file as a POINT Reliability value of &endash;1).
Derivatives are calculated using Finite Difference Algorithms.
Given the signal:
x(ti) for i=1, 2, …, n The second derivative is calculated using: xDDot(ti)= (x(ti+1)-2x(ti)+x(ti-1))/( (ti+1)-(ti) )^2