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sdmauxScalarmul.c
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Tue, Jul 15, 14:42

sdmauxScalarmul.c
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/* ************************************************************
MODULE sdmaux*.c -- Several low-level subroutines for the
mex-files in the Self-Dual-Minimization package.
% This file is part of SeDuMi 1.1 by Imre Polik and Oleksandr Romanko
% Copyright (C) 2005 McMaster University, Hamilton, CANADA (since 1.1)
%
% Copyright (C) 2001 Jos F. Sturm (up to 1.05R5)
% Dept. Econometrics & O.R., Tilburg University, the Netherlands.
% Supported by the Netherlands Organization for Scientific Research (NWO).
%
% Affiliation SeDuMi 1.03 and 1.04Beta (2000):
% Dept. Quantitative Economics, Maastricht University, the Netherlands.
%
% Affiliations up to SeDuMi 1.02 (AUG1998):
% CRL, McMaster University, Canada.
% Supported by the Netherlands Organization for Scientific Research (NWO).
%
% This program is free software; you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation; either version 2 of the License, or
% (at your option) any later version.
%
% This program is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with this program; if not, write to the Free Software
% Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
% 02110-1301, USA
************************************************************ */
#include "blksdp.h"
/* ************************************************************
TIME-CRITICAL PROCEDURE -- scalarmul
Computes r = alpha * x using BLAS.
************************************************************ */
void scalarmul(double *r, const double alpha,const double *x,const mwIndex n)
{
mwIndex one=1;
#ifdef PC
dcopy(&n,x,&one,r,&one);
dscal(&n,&alpha,r,&one);
#endif
#ifdef UNIX
dcopy_(&n,x,&one,r,&one);
dscal_(&n,&alpha,r,&one);
#endif
return;
}
/* ************************************************************
TIME-CRITICAL PROCEDURE -- addscalarmul
Computes r += alpha * x using BLAS.
************************************************************ */
void addscalarmul(double *r, const double alpha,const double *x,const mwIndex n)
{
/*USE BLAS*/
mwIndex one=1;
#ifdef PC
daxpy(&n,&alpha,x,&one,r,&one);
#endif
#ifdef UNIX
daxpy_(&n,&alpha,x,&one,r,&one);
#endif
return;
}
/* ************************************************************
TIME-CRITICAL PROCEDURE -- subscalarmul(x,alpha,y,n)
Computes x -= alpha * y using BLAS.
************************************************************ */
void subscalarmul(double *x, const double alpha, const double *y, const mwIndex n)
{
/*USE BLAS*/
mwIndex one=1;
const double minusalpha=-alpha;
#ifdef PC
daxpy(&n,&minusalpha,y,&one,x,&one);
#endif
#ifdef UNIX
daxpy_(&n,&minusalpha,y,&one,x,&one);
#endif
return;
}

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