centreofpressure_data

 data = CENTREOFPRESSURE_DATA(data,localOr,globalOr,thresh) computes COP in global
 coordinate system for force plates 1,2,3

 ARGUMENTS
  data     ...  Zoo struct containing required channel data
  localOr  ...  Coordinates of FP origin in local coordinate system
  globalOr ...  Coordinates of FP origin in global coordinate system
  orientFP ...  Orientation matrix of FP for tranformation of COP data
                into global coordinates
  thresh   ...  Threshold force (N) to compute COP. Default = 20N (Agrees with Vicon)

 RETURN
  data     ...  Zoo struct with centre of pressure data appended

 NOTES
 - see http://www.kwon3d.com/theory/grf/cop.html

 See also getFPLocalOrigin, getFPGlobalOrigin