jc = CHORDPIG(a,b,c,delta) computes knee and ankle joint centres according to the plug-in gait 'chord' function ARGUMENTS a ... wand marker data (n x 3 matrix) b ... proximal joint centre (n x 3 matrix) c ... distal marker (n x 3 matrix) delta ... (jointWidth/2) + mDiameter/2 (double); RETURNS jc ... The joint centre in global coordinate system See also bmech_jointcentrePiG, jointcentrePiG_dat NOTES - See vicon user manual for chord function definition (see help fileS) - Thanks to Seungeun Yeon, Mathew Schwartz, Filipe Alves Caixeta, and Robert Van-wesep. See: https://github.com/cadop/pyCGM