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MATXRZ

       SUBROUTINE  MATXRZ (ANGLE)
 C$    (Transform -- Rotation About Z Axis)
 C$    Compute a 4-dimensional transformation matrix corresponding
 C$    to a  rotation by  "ANGLE"  degrees about  the Z  axis.   A
 C$    positive angle represents a counterclockwise rotation.
 C$
 C$    The stored transformation matrix is multiplied on the right
 C$    by the computed rotation 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)