NAME

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

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