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/*
* Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
* Copyright (C) 2008-2008 - INRIA - Allan SIMON
*
* This file must be used under the terms of the CeCILL.
* This source file is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at
* http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt
*
*/
#include "matrixDivision.h"
#include "lapack.h"
#include <string.h>
#include <stdio.h>
void drdiva ( double * in1, int lines1, int columns1,
double * in2, int lines2, int columns2,
double * out){
char cNorm = 0;
int iExit = 0;
/*temporary variables*/
int iWork = 0;
int iInfo = 0;
int iMax = 0;
double dblRcond = 0;
double dblEps = 0;
double dblAnorm = 0;
double *pAf = NULL;
double *pAt = NULL;
double *pBt = NULL;
double *pDwork = NULL;
int *pRank = NULL;
int *pIpiv = NULL;
int *pJpvt = NULL;
int *pIwork = NULL;
iWork = Max(4 * columns2, Max(Min(lines2, columns2) + 3 * lines2 + 1, 2 * Min(lines2, columns2) + lines1));
/* Array allocations*/
pAf = (double*)malloc(sizeof(double) * (unsigned int)columns2 * (unsigned int)lines2);
pAt = (double*)malloc(sizeof(double) * (unsigned int)columns2 *(unsigned int) lines2);
pBt = (double*)malloc(sizeof(double) * (unsigned int)Max(lines2,columns2) * (unsigned int)lines1);
pRank = (int*)malloc(sizeof(int));
pIpiv = (int*)malloc(sizeof(int) * (unsigned int)columns2);
pJpvt = (int*)malloc(sizeof(int) * (unsigned int)lines2);
pIwork = (int*)malloc(sizeof(int) * (unsigned int)columns2);
cNorm = '1';
pDwork = (double*)malloc(sizeof(double) * (unsigned int)iWork);
dblEps = getRelativeMachinePrecision() ;
dblAnorm = dlange_(&cNorm, &lines2, &columns1, in2, &lines2, pDwork);
/*tranpose A and B*/
dtransposea(in2, lines2, columns2, pAt);
dtransposea(in1, lines1, columns2, pBt);
if(lines2 == columns2)
{
cNorm = 'F';
dlacpy_(&cNorm, &columns2, &columns2, pAt, &columns2, pAf, &columns2);
dgetrf_(&columns2, &columns2, pAf, &columns2, pIpiv, &iInfo);
if(iInfo == 0)
{
cNorm = '1';
dgecon_(&cNorm, &columns2, pAf, &columns2, &dblAnorm, &dblRcond, pDwork, pIwork, &iInfo);
if(dblRcond > sqrt(dblEps))
{
cNorm = 'N';
dgetrs_(&cNorm, &columns2, &lines1, pAf, &columns2, pIpiv, pBt, &columns2, &iInfo);
dtransposea(pBt, columns2, lines1, out);
iExit = 1;
}
}
}
if(iExit == 0)
{
dblRcond = sqrt(dblEps);
cNorm = 'F';
iMax = Max(lines2, columns2);
memset(pJpvt, 0x00, (unsigned int)sizeof(int) * (unsigned int)lines2);
dgelsy_(&columns2, &lines2, &lines1, pAt, &columns2, pBt, &iMax,
pJpvt, &dblRcond, &pRank[0], pDwork, &iWork, &iInfo);
if(iInfo == 0)
{
/* TransposeRealMatrix(pBt, lines1, lines2, out, Max(lines1,columns1), lines2);*/
/*Mega caca de la mort qui tue des ours a mains nues
mais je ne sais pas comment le rendre "beau" :(*/
{
int i,j,ij,ji;
for(j = 0 ; j < lines2 ; j++)
{
for(i = 0 ; i < lines1 ; i++)
{
ij = i + j * lines1;
ji = j + i * Max(lines2, columns2);
out[ij] = pBt[ji];
}
}
}
}
}
free(pAf);
free(pAt);
free(pBt);
free(pRank);
free(pIpiv);
free(pJpvt);
free(pIwork);
free(pDwork);
}
int Max(int _dblVar1, int _dblVar2)
{
if(_dblVar1 > _dblVar2)
return _dblVar1;
return _dblVar2;
}
int Min(int _dblVar1, int _dblVar2)
{
if(_dblVar1 < _dblVar2)
return _dblVar1;
return _dblVar2;
}
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