dlabad.f man page

dlabad.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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Referenced By

dlabad(3) is an alias of dlabad.f(3).

Sat Nov 16 2013 Version 3.4.2 LAPACK