===== SEG VELOCITY =====

This model-based item represents the velocity of the specified segment's center of mass.

For example, you can compute the velocity of the left foot relative to the left shank and resolve the resulting signal into the lab's coordinate system.

{{:segvelocitydlg.jpg}} 

Derivatives are calculated using Finite Difference Algorithms.

<code>
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) )
</code>