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--- visual3d:documentation:pipeline:signal_commands:first_derivative_of_a_signal [2024/06/19 13:38] – removed sgranger
+++ visual3d:documentation:pipeline:signal_commands:first_derivative_of_a_signal [2024/12/21 12:48] (current) – wikisysop
@@ Line 1: / Line 1: @@
+====== First Derivative of a Signal ======
+See also: [[visual3d:documentation:pipeline:signal_commands:first_derivative]]
+||
+|{{:First_Derivative.png}}\\ \\ **First_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 first 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 first derivative is calculated using:
+xDot(ti)= (x(ti+1)-x(ti-1))/( (ti+1)-(ti-1) )