redhat man page for dlabad

DLABAD(l)								 )								 DLABAD(l)

NAME
       DLABAD - take 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

SYNOPSIS
       SUBROUTINE DLABAD( SMALL, LARGE )

	   DOUBLE	  PRECISION LARGE, SMALL

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) 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) 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 version 3.0						   15 June 2000 							 DLABAD(l)