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| SRC/lapack_64_obj/slamch.f(3) | Library Functions Manual | SRC/lapack_64_obj/slamch.f(3) | 
NAME¶
SRC/lapack_64_obj/slamch.f
SYNOPSIS¶
Functions/Subroutines¶
real function SLAMCH (cmach)
  
  SLAMCH real function SLAMC3 (a, b)
  
  SLAMC3
  
Function/Subroutine Documentation¶
real function SLAMC3 (real a, real b)¶
SLAMC3 Purpose:
!> SLAMC3 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
!>
B
!> The values A and B. !>
Definition at line 171 of file slamch.f.
real function SLAMCH (character cmach)¶
SLAMCH
Purpose:
!> !> SLAMCH determines single precision machine parameters. !>
Parameters
CMACH
!> CMACH is 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) !>
Author
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Definition at line 68 of file slamch.f.
Author¶
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