SLAMCH - Online Linux Manual Page

Section : 1
Updated : November 2008
Source : LAPACK auxiliary routine (version 3.2)
Note : LAPACK auxiliary routine (version 3.2)
NAMESLAMCH - single precision machine parameters
SYNOPSISREAL FUNCTION  SLAMCH( CMACH )  CHARACTER CMACH
PURPOSESLAMCH determines single precision machine parameters.
ARGUMENTSCMACH (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) 0
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