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NAME
     dlamch - determine double precision machine parameters

SYNOPSIS
     DOUBLE PRECISION FUNCTION DLAMCH( CMACH )

     CHARACTER CMACH



     #include <sunperf.h>

     double dlamch(char 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)  digits  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)

Партнёры:

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