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.


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