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 man
tissa rnd = 1.0 when rounding occurs in addition,
0.0 otherwise emin = minimum exponent before (grad
ual) underflow rmin = underflow threshold -
base**(emin-1) emax = largest exponent before over
flow rmax = overflow threshold -
(base**emax)*(1-eps)
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