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/* Copyright (C) 2016 - IIT Bombay - FOSSEE
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
Author: Siddhesh Wani
Organization: FOSSEE, IIT Bombay
Email: toolbox@scilab.in
*/
#include <stdlib.h>
#include <string.h>
#include "matrixDivision.h"
#include "lapack.h"
void i8ldivma (int8* in1, int lines1, int columns1 ,
int8* in2, int lines2, int columns2 ,
int8* out ){
char cNorm = 0;
int iExit = 0;
/*temporary variables*/
int iWork = 0;
int iInfo = 0;
int iMax = 0;
int8 dblRcond = 0;
int8 dblEps = 0;
int8 dblAnorm = 0;
int8 *pAf = NULL;
int8 *pXb = NULL;
int8 *pDwork = NULL;
int *pRank = NULL;
int *pIpiv = NULL;
int *pJpvt = NULL;
int *pIwork = NULL;
iWork = max(4 * columns1, max(min(lines1, columns1) + 3 * lines1 + 1, 2 * min(lines1, columns1) + columns2));
lines2 = 0 ;
/* Array allocations*/
pAf = (int8*)malloc(sizeof(int8) * (unsigned int) lines1 * (unsigned int) columns1);
pXb = (int8*)malloc(sizeof(int8) * (unsigned int) max(lines1,columns1) * (unsigned int) columns2);
pRank = (int*)malloc(sizeof(int));
pIpiv = (int*)malloc(sizeof(int) *(unsigned int) columns1);
pJpvt = (int*)malloc(sizeof(int) *(unsigned int) columns1);
pIwork = (int*)malloc(sizeof(int) *(unsigned int) columns1);
cNorm = '1';
pDwork = (int8*)malloc(sizeof(int8) *(unsigned int)iWork);
dblEps = getRelativeMachinePrecision() ;
dblAnorm = dlange_(&cNorm, &lines1, &columns1, in1, &lines1, pDwork);
if(lines1 == columns1)
{
cNorm = 'F';
dlacpy_(&cNorm, &columns1, &columns1, in1, &columns1, pAf, &columns1);
dgetrf_(&columns1, &columns1, pAf, &columns1, pIpiv, &iInfo);
if(iInfo == 0)
{
cNorm = '1';
C2F(dgecon)(&cNorm, &columns1, pAf, &columns1, &dblAnorm, &dblRcond, pDwork, pIwork, &iInfo);
if(dblRcond > sqrt(dblEps))
{
cNorm = 'N';
C2F(dgetrs)(&cNorm, &columns1, &columns2, pAf, &columns1, pIpiv, in2, &columns1, &iInfo);
cNorm = 'F';
C2F(dlacpy)(&cNorm, &columns1, &columns2, in2, &columns1, out, &columns1);
iExit = 1;
}
}
}
if(iExit == 0)
{
dblRcond = sqrt(dblEps);
cNorm = 'F';
iMax = max(lines1, columns1);
C2F(dlacpy)(&cNorm, &lines1, &columns2, in2, &lines1, pXb, &iMax);
memset(pJpvt, 0x00,(unsigned int) sizeof(int) * (unsigned int) columns1);
C2F(dgelsy)( &lines1, &columns1, &columns2, in1, &lines1, pXb, &iMax,
pJpvt, &dblRcond, &pRank[0], pDwork, &iWork, &iInfo);
if(iInfo == 0)
{
cNorm = 'F';
C2F(dlacpy)(&cNorm, &columns1, &columns2, pXb, &iMax, out, &columns1);
}
}
free(pAf);
free(pXb);
free(pRank);
free(pIpiv);
free(pJpvt);
free(pIwork);
free(pDwork);
}
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