SLAMCH(3)      LAPACK routine of NEC Numeric Library Collection      SLAMCH(3)



NAME
       SLAMCH - determine single precision machine parameters

SYNOPSIS
       REAL FUNCTION SLAMCH( CMACH )

           CHARACTER CMACH

PURPOSE
       SLAMCH determines single precision machine parameters.

ARGUMENTS
       CMACH   (input) 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)



LAPACK routine                  31 October 2017                      SLAMCH(3)