NAME

       lamch - lamch: machine parameters

SYNOPSIS

   Functions
       double precision function dlamch (cmach)
           DLAMCH
       real function slamch (cmach)
           SLAMCH

Detailed Description

Function Documentation

   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.

   real function slamch (character cmach)
       SLAMCH

       Purpose:

            SLAMCH determines single precision machine parameters.

       Parameters
           CMACH

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

Author

       Generated automatically by Doxygen for LAPACK from the source code.

Version 3.12.0                              Thu Aug 28 2025 19:20:45                                    lamch(3)