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dlapy2

 NAME
      DLAPY2 - return sqrt(x**2+y**2), taking care not to cause
      unnecessary overflow

 SYNOPSIS
      DOUBLE PRECISION FUNCTION DLAPY2( X, Y )

          DOUBLE       PRECISION X, Y

 PURPOSE
      DLAPY2 returns sqrt(x**2+y**2), taking care not to cause
      unnecessary overflow.

 ARGUMENTS
      X       (input) DOUBLE PRECISION
              Y       (input) DOUBLE PRECISION X and Y specify the
              values x and y.