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dlapy3

 NAME
      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.