[ новости /+++ | форум | теги | ]

NAME
     dlabad - take as input the values  computed  by  SLAMCH  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



     #include <sunperf.h>

     void dlabad(double *small, double *large) ;

PURPOSE
     DLABAD takes as input the  values  computed  by  SLAMCH  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.

Партнёры:

Хостинг: