1. Manuals
  2. Tumbleweed
  3. lapack-man
  4. DROUNDUP_LWORK(3)

Scroll to navigation

/home/abuild/rpmbuild/BUILD/lapack-3.12.0/INSTALL/droundup_lwork.f(3) Library Functions Manual /home/abuild/rpmbuild/BUILD/lapack-3.12.0/INSTALL/droundup_lwork.f(3)

NAME

/home/abuild/rpmbuild/BUILD/lapack-3.12.0/INSTALL/droundup_lwork.f

SYNOPSIS

Functions/Subroutines


double precision function DROUNDUP_LWORK (lwork)
DROUNDUP_LWORK

Function/Subroutine Documentation

double precision function DROUNDUP_LWORK (integer lwork)

DROUNDUP_LWORK

Purpose:

!>
!> DROUNDUP_LWORK deals with a subtle bug with returning LWORK as a Float.
!> This routine guarantees it is rounded up instead of down by
!> multiplying LWORK by 1+eps when it is necessary, where eps is the relative machine precision.
!> E.g.,
!>
!>        float( 9007199254740993            ) == 9007199254740992
!>        float( 9007199254740993 ) * (1.+eps) == 9007199254740994
!>
!> \return DROUNDUP_LWORK
!> \verbatim
!>         DROUNDUP_LWORK >= LWORK.
!>         DROUNDUP_LWORK is guaranteed to have zero decimal part.
!>

Parameters

LWORK Workspace size.

Author

Weslley Pereira, University of Colorado Denver, USA

Further Details:

!>  This routine was inspired in the method `magma_zmake_lwork` from MAGMA.
!>  \see https://bitbucket.org/icl/magma/src/master/control/magma_zauxiliary.cpp
!>

Definition at line 58 of file droundup_lwork.f.

Author

Generated automatically by Doxygen for LAPACK from the source code.

Version 3.12.0 LAPACK