INSTALL/dlamch.f(3)        Library Functions Manual        INSTALL/dlamch.f(3)

NAME
       INSTALL/dlamch.f

SYNOPSIS
   Functions/Subroutines
       double precision function dlamch (cmach)
           DLAMCH
       double precision function dlamc3 (a, b)
           DLAMC3

Function/Subroutine Documentation
   double precision function dlamc3 (double precision a, double precision b)
       DLAMC3 Purpose:

        DLAMC3  is intended to force  A  and  B  to be stored prior to doing
        the addition of  A  and  B ,  for use in situations where optimizers
        might hold one of these in a register.

       Author
           LAPACK is a software package provided by Univ. of Tennessee, Univ.
           of California Berkeley, Univ. of Colorado Denver and NAG Ltd..

       Parameters
           A

                     A is a DOUBLE PRECISION

           B

                     B is a DOUBLE PRECISION
                     The values A and B.

       Definition at line 171 of file dlamch.f.

   double precision function dlamch (character cmach)
       DLAMCH

       Purpose:


            DLAMCH determines double precision machine parameters.

       Parameters
           CMACH

                     CMACH is 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)

       Author
           Univ. of Tennessee

           Univ. of California Berkeley

           Univ. of Colorado Denver

           NAG Ltd.

       Definition at line 68 of file dlamch.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

LAPACK                          Version 3.12.0             INSTALL/dlamch.f(3)