DLAPY3  -  return sqrt(x**2+y**2+z**2), taking care not to
       cause unnecessary overflow


SYNOPSIS

       DOUBLE PRECISION FUNCTION DLAPY3( X, Y, Z )

           DOUBLE       PRECISION X, Y, Z


PURPOSE

       DLAPY3 returns sqrt(x**2+y**2+z**2), taking  care  not  to
       cause unnecessary overflow.


ARGUMENTS

       X       (input) DOUBLE PRECISION
               Y        (input)  DOUBLE PRECISION Z       (input)
               DOUBLE PRECISION X, Y and Z specify the values  x,
               y and z.


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