Format

VX(I, J, K, L)

Description

The VX function computes the X component of the relative translational velocity of marker I with respect to marker J resolved in the coordinate system of marker K. The time derivatives are taken in the marker L. Arguments J, K, and L are optional and default to 0, which refers to Global Frame.

Example

<Post_Request

    comment = "vel-expr"

    id      = "70000043"

    type    = "EXPRESSION"

    expr1   = "NULL"

    expr2   = "VX(30301010,30301011,30301011)"

    expr3   = "VY(30301010,30301011,30301011)"

    expr4   = "VZ(30301010,30301011,30301011)"

    expr5   = "NULL"

    expr6   = "WX(30301010,30301011,30301011)"

    expr7   = "WY(30301010,30301011,30301011)"

    expr8   = "WZ(30301010,30301011,30301011)"

/>

Arguments

I

The marker whose velocity is to be computed.

J

The marker with respect to which the velocity is to be computed.  This argument is optional.  The default is Global Frame.

K

The relative velocity vector is resolved in the coordinate system of this marker.  This argument is optional.  The default is Global Frame.

L

Time derivatives are taken in the coordinate system of this marker.  This argument is optional.  The default is Global Frame.