dlamch.f man page
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 172 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 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
Definition at line 64 of file dlamch.f.
Generated automatically by Doxygen for LAPACK from the source code.
dlamc3(3) and dlamch(3) are aliases of dlamch.f(3).