dlabad.f(3) LAPACK dlabad.f(3)NAMEdlabad.f-
SYNOPSIS
Functions/Subroutines
subroutine dlabad (SMALL, LARGE)
DLABAD
Function/Subroutine Documentation
subroutine dlabad (double precisionSMALL, double precisionLARGE)
DLABAD
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.
Parameters:
SMALL
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
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.
Author:
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
November 2011
Definition at line 75 of file dlabad.f.
Author
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Version 3.4.2 Sat Nov 16 2013 dlabad.f(3)
