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I want to be able to only analyze the actual loading portion of a curve

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Michael
Michael 2014-10-1
评论： Star Strider 2014-10-2
Hello,
I am new to MATLAB, and still trying to figure things out. Please forgive me if I have a overly simple question.
Currently, I am working with multi-axial force data (Fx, Fy, Fz) collected during animal locomotion trials. I am trying to calculate certain variables from the curve, including impulse, Fz peak, etc. In order to start analyzing, I was hoping to clip the curve based on when loading actually occurs (see image below), therefore limiting any extraneous noise that may alter the data.
I would also like MATLAB to report the beginning and end times for a particular loading cycle.
Any help on this would be greatly appreciated.
All the best, Michael

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Star Strider
Star Strider 2014-10-1
I would threshold the blue curve to find the first and last indices where it exceeds 1. You can then subtract and add a few indices at the beginning and end respectively to include everything you need. Use the find command twice, once with the 'first' option to find the beginning of the rise of the blue curve, and 'last' to find the end. Those indices will be the same for all your curves and for your time variable.
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