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dlamch.f(3) | LAPACK | dlamch.f(3) |
NAME¶
dlamch.f -SYNOPSIS¶
Functions/Subroutines¶
double precision function dlamch (CMACH)
Function/Subroutine Documentation¶
double precision function dlamc3 (double precisionA, double precisionB)¶
DLAMC3 Purpose: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.Author:
LAPACK is a software package provided by Univ. of
Tennessee, Univ. of California Berkeley, Univ. of Colorado Denver and NAG
Ltd..
Date:
November 2011
Parameters:
A
Definition at line 172 of file dlamch.f.
A is a DOUBLE PRECISIONB
B is a DOUBLE PRECISION The values A and B.
double precision function dlamch (characterCMACH)¶
DLAMCH Purpose:DLAMCH determines double precision machine parameters.
CMACH
Author:
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)
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
November 2011
Definition at line 64 of file dlamch.f.
Author¶
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