table of contents
/home/abuild/rpmbuild/BUILD/lapack-3.12.0/INSTALL/dlamch.f(3) | Library Functions Manual | /home/abuild/rpmbuild/BUILD/lapack-3.12.0/INSTALL/dlamch.f(3) |
NAME¶
/home/abuild/rpmbuild/BUILD/lapack-3.12.0/INSTALL/dlamch.f
SYNOPSIS¶
Functions/Subroutines¶
double precision function DLAMCH (cmach)
DLAMCH double precision function DLAMC3 (a, b)
DLAMC3
Function/Subroutine Documentation¶
double precision function DLAMC3 (double precision a, double precision b)¶
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..
Parameters
A
!> A is a DOUBLE PRECISION !>
B
!> B is a DOUBLE PRECISION !> The values A and B. !>
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. !>
Parameters
A
B
B
!> The values A and B. !>
Definition at line 171 of file dlamch.f.
double precision function DLAMCH (character cmach)¶
DLAMCH DLAMCHF77 deprecated
Purpose:
!> !> DLAMCH determines double precision machine parameters. !>
Parameters
CMACH
!> CMACH is CHARACTER*1 !> 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) !>
Author
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Purpose:
!> !> DLAMCHF77 determines double precision machine parameters. !>
Parameters
CMACH
!> 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) !>
Author
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Definition at line 68 of file dlamch.f.
Author¶
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Version 3.12.0 | LAPACK |