DLABAD(3)      LAPACK routine of NEC Numeric Library Collection      DLABAD(3)



NAME
       DLABAD

SYNOPSIS
       SUBROUTINE DLABAD (SMALL, LARGE)



PURPOSE
            DLABAD takes as input the values computed by DLAMCH for underflow and
            overflow, and returns the square root of each of these values if the
            log of LARGE is sufficiently large.  This subroutine is intended to
            identify machines with a large exponent range, such as the Crays, and
            redefine the underflow and overflow limits to be the square roots of
            the values computed by DLAMCH.  This subroutine is needed because
            DLAMCH does not compensate for poor arithmetic in the upper half of
            the exponent range, as is found on a Cray.




ARGUMENTS
           SMALL     (input/output)
                     SMALL is DOUBLE PRECISION
                     On entry, the underflow threshold as computed by DLAMCH.
                     On exit, if LOG10(LARGE) is sufficiently large, the square
                     root of SMALL, otherwise unchanged.

           LARGE     (input/output)
                     LARGE is DOUBLE PRECISION
                     On entry, the overflow threshold as computed by DLAMCH.
                     On exit, if LOG10(LARGE) is sufficiently large, the square
                     root of LARGE, otherwise unchanged.



LAPACK routine                  31 October 2017                      DLABAD(3)