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MATXTR

       SUBROUTINE  MATXTR (X,Y,Z)
 C$    (Transform -- Translation Matrix)
 C$    Construct a  4  x  4 translation  matrix  corresponding  to
 C$    moving the origin to the point (X,Y,Z).
 C$
 C$    The stored transformation matrix is multiplied on the right
 C$    by the computed translation matrix.
 C$
 C$    MATXSM() sets  the  stored  matrix  to  a  starting  value,
 C$    MATXIM() inquires the current  value, and MATXIO()  selects
 C$    printing of intermediate matrices.
 C$    (08-FEB-90)