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MATXRA

       SUBROUTINE  MATXRA (PX,PY,PZ, DX,DY,DZ, ANGLE)
 C$    (Transform -- Rotation About Arbitrary Axis)
 C$    Compute a 4-dimensional transformation matrix corresponding
 C$    to a rotation  by "ANGLE"  degrees about  an axis  emerging
 C$    from a point (PX,PY,PZ) and lying in the direction given by
 C$    the vector (DX,DY,DZ).  The stored transformation matrix is
 C$    multiplied on the right by the computed projection  matrix.
 C$
 C$    If (DX,DY,DZ)  is specified  as (0,0,0),  an error  message
 C$    will be  issued and  a unit  matrix returned.   A  positive
 C$    rotation angle corresponds  to a counterclockwise  rotation
 C$    about the axis.
 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$
 C$    (07-FEB-90)