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--- visual3d:documentation:pipeline:signal_commands:second_derivative_of_a_signal [2024/06/17 17:08] – removed sgranger
+++ visual3d:documentation:pipeline:signal_commands:second_derivative_of_a_signal [2024/07/17 15:46] (current) – created sgranger
@@ Line 1: / Line 1: @@
+====== Second Derivative of a Signal ======
+||
+|{{:Second_Derivative.png}}\\ \\ **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