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MATPX

       SUBROUTINE  MATPX (T,CX,CY,CZ,CH)
 C$    (X-Axis Perspective Matrix)
 C$    Return in T(*,*) a four-dimensional perspective  projection
 C$    matrix corresponding  to the  X  = 0  view plane  with  the
 C$    center of projection  at the point  (CX,CY,CZ,CH).  If  the
 C$    center of projection is on the view plane, an error message
 C$    will be generated and a unit matrix returned.
 C$    (30-JAN-82)