redhat man page for dlamch

DLAMCH(l)								 )								 DLAMCH(l)

NAME
       DLAMCH - determine double precision machine parameters

SYNOPSIS
       DOUBLE PRECISION FUNCTION DLAMCH( CMACH )

	   CHARACTER	CMACH

PURPOSE
       DLAMCH determines double precision machine parameters.

ARGUMENTS
       CMACH   (input) CHARACTER*1
	       Specifies the value to be returned by DLAMCH:
	       = 'E' or 'e',   DLAMCH := eps
	       = 'S' or 's ,   DLAMCH := sfmin
	       = 'B' or 'b',   DLAMCH := base
	       = 'P' or 'p',   DLAMCH := eps*base
	       = 'N' or 'n',   DLAMCH := t
	       = 'R' or 'r',   DLAMCH := rnd
	       = 'M' or 'm',   DLAMCH := emin
	       = 'U' or 'u',   DLAMCH := rmin
	       = 'L' or 'l',   DLAMCH := emax
	       = 'O' or 'o',   DLAMCH := rmax

	       where

       eps   = relative machine precision
	     sfmin  = safe minimum, such that 1/sfmin does not overflow base  = base of the machine prec  = eps*base t	   = number of (base) dig-
	     its in the mantissa rnd   = 1.0 when rounding occurs in addition, 0.0 otherwise emin  = minimum exponent before  (gradual)  underflow
	     rmin    =	 underflow  threshold  -  base**(emin-1)  emax	 =  largest  exponent  before  overflow  rmax	=  overflow  threshold	 -
	     (base**emax)*(1-eps)

LAPACK version 3.0						   15 June 2000 							 DLAMCH(l)