FXYZ
The FXYZ measure returns the net translational force vector acting on marker i, represented in the coordinate system of marker k. All force and constraint elements acting between markers i and j are included in the calculation of the force. If j is not specified, FXYZ measures the sum of all force and constraint elements acting on marker i. If k is not specified or if k=0, the force is represented in the GROUND coordinate system. To specify k without specifying j, use j=0.
Format
FXYZ(i[,j][,k])
Arguments
i | An integer that specifies the identifier of the marker at which the magnitude of the net force is to be calculated. |
j | A second integer that specifies a marker identifier. All forces acting between the [i,j] pair are to be included in the calculation. Set j = 0 or do not specify if you are interested in all forces acting on marker i. |
k | An integer that specifies the identifier of a marker (coordinate system) in which the x-component of the force is to be returned. k defaults to the global coordinate system when it is not specified. |
Extended Definition
Mathematically, FXYZ is calculated as:
where:
■FX is the FX measure.
■FY is the FY measure.
■FZ is the FZ measure.
Examples
Magnitude of torque at marker 5 due to all forces applied at marker 4.
VARIABLE/1, FUN=MAG(DXYZ(4,5)%FXYZ(4))