COP = COP_ONEPLATE(F,M,a,b,c,cutoff) calculats COP of force plates
ARGUMENTS
F ... n x 3 matrix w/ columns Fx, Fy, Fz. Directly from FP data
M ... n x 3 matrix w/ columns Mx, My, Mz, moments of force plate
a,b,c ... true coordinates from manufacturer (metres) centre of plate
cutoff ... Threshold from which to start computing COP. Default 20N
RETURNS
COP ... struct containing COP info for both plates
Updated Jan 14th 2008
-replace NaN with first and last values of array
-cutoff is back to 60N to be consistent with the rest of thesis
Updated Jan 4th 2013
- cutoff magnitude default is 20N to match vicon output
Updated Jan 7th 2013
- fix removal of NaNs at start and end of data
NOTES
-COP coordinates are outputted in the original FP coordinate system, ie
origin in is center of FPlate
- Moments must be expressed about the true center of the plate.
moment adjustment calculations (based on AMTI) not done here...use
moment_coordchange.m
Mx = Mxo - Fy*zo - Fz*yo
My = Myo + Fx*zo + Fz*xo
Mz = Mzo - Fx*yo - Fy*xo
Current McGill Biomechanics Lab FP AMTI OR6-5-1000 s.n. 3403
x = -0.778/1000; %mm to m
y = 0.459/1000;
z = -37.635/1000;