dlamch.f(3) LAPACK dlamch.f(3)
DOUBLE PRECISION function dlamch (CMACH)
DOUBLE PRECISION function dlamc3 (A, B)
DOUBLE PRECISION function dlamc3 (double precisionA, double precisionB)
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.
LAPACK is a software package provided by Univ. of Tennessee, Univ. of California
Berkeley, Univ. of Colorado Denver and NAG Ltd..
A is a DOUBLE PRECISION
B is a DOUBLE PRECISION
The values A and B.
Definition at line 168 of file dlamch.f.
DOUBLE PRECISION function dlamch (characterCMACH)
DLAMCH determines double precision machine parameters.
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
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)
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
Definition at line 64 of file dlamch.f.
Generated automatically by Doxygen for LAPACK from the source code.
Version 3.4.2 Tue Sep 25 2012 dlamch.f(3)