PSI

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.

Format

PSI(I, J)

Arguments

I: The marker whose rotational displacement is to be computed. Must be specified.
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.

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"
/>