Format

PSI(I, J)

Description

The PSI function computes the first angle, in radians, of a body-2 Euler angle rotation sequence (body-3, body-1, body-3) of marker I with respect to marker J. The first argument, marker I, must be specified, whereas the second argument, marker J, is optional.

Example

<Post_Request

    comment             = "O_PSI_T_Phi"

    id                  = "70000013"

    type                = "EXPRESSION"

    expr1               = "NULL"

    expr2               = "PSI(30102190)"

    expr3               = "THETA(30102190)"

    expr4               = "PHI(30102190)"

    expr5               = "NULL"

    expr6               = "NULL"

    expr7               = "NULL"

    expr8               = "NULL"

/>

Arguments

I

The marker whose rotational displacement is to be computed.

J

The marker with respect to which the rotational displacement is to be computed.  This argument is optional.  If omitted, it defaults to the ground coordinate system.