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Velocity Measures

Velocity Measures

Velocity Measures

(OP)
I am creating a biomechanical model of the human neck.  I have created measures that calculate position, velocity, and acceleration of different muscles during motions, and am having a hard time with the velocity.  

When the velocity function is made, I specified the to_marker and the from_marker and the reference_marker.  I created 2 functions, one where the reference_marker was the to_marker and one where it was the from_marker.  The final velocities are different, and I am wondering where I went wrong.  I expected them to be the same, as the same 2 markers are used in both cases.  Any help would be appreciated, thanks!

RE: Velocity Measures

(OP)
There is a velocity jump at the beginning of each trial, and those are opposite, which I expected, but R_SCM_VEL ends with a final velocity of 53 mm/sec, while R_SCM_VEL2 ends with a final velocity of 49mm/sec.  The code for the creation of the markers is below.

R_SCM_VEL
!!!!!!!!Beginning

if cond=(.gui.funcBldr.displayed)
  if cond=(eval(alert("warning", "Function Builder is already displayed.  Proceeding will erase existing contents.  Proceed?", "Yes", "No", "",1) != 1))
     return
  end
end
int dia disp dia=.gui.funcBldr par="Function Measure", "", "", "", (UNIQUE_NAME("FUNCTION_MEA"))
        measure cre function measure=.model_1.R_SCM_VEL function="VM(MARKER_84, MARKER_85, MARKER_85)" &
          units = no_units   create_measure_display = yes
    ! set measure plotting attributes
    measure attributes measure=.model_1.R_SCM_VEL &
          &
          &
        
  int dialog execute dialog=.gui.funcBldr undisp=yes
  
!!!!!!!End

R_SCM_VEL2

!!!!!!!!Beginning

if cond=(.gui.funcBldr.displayed)
  if cond=(eval(alert("warning", "Function Builder is already displayed.  Proceeding will erase existing contents.  Proceed?", "Yes", "No", "",1) != 1))
     return
  end
end
int dia disp dia=.gui.funcBldr par="Function Measure", "", "", "", (UNIQUE_NAME("FUNCTION_MEA"))
        measure cre function measure=.model_1.R_SCM_VEL2 function="VM(MARKER_84, MARKER_85, MARKER_85)" &
          units = no_units   create_measure_display = yes
    ! set measure plotting attributes
    measure attributes measure=.model_1.R_SCM_VEL2 &
          &
          &
        
  int dialog execute dialog=.gui.funcBldr undisp=yes
  
!!!!!!!End

Thanks again for your help,

Zach

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