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--- visual3d:documentation:pipeline:model_based_data_commands:seg_velocity [2024/06/17 18:21] – created sgranger
+++ visual3d:documentation:pipeline:model_based_data_commands:seg_velocity [2024/11/11 14:05] (current) – wikisysop
@@ Line 1: / Line 1: @@
+===== SEG VELOCITY =====
-There is currently no text in this page. You can [[Special:Search/Model_Based_Item:_SEG_VELOCITY|search for this page title]] in other pages, [[/wiki.has-motion.com/index.php?title=Special:Log&page=Model_Based_Item:_SEG_VELOCITY|search the related logs]], or [[/wiki.has-motion.com/index.php?title=Model_Based_Item:_SEG_VELOCITY&action=edit|create this page]].
+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>