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/*
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 * -- SuperLU routine (version 3.0) --
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 * Univ. of California Berkeley, Xerox Palo Alto Research Center,
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 * and Lawrence Berkeley National Lab.
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 * October 15, 2003
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 *
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 */
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#include "slu_ddefs.h"
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main(int argc, char *argv[])
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{
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    SuperMatrix A;
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    NCformat *Astore;
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    double   *a;
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    int      *asub, *xa;
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    int      *perm_c; /* column permutation vector */
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    int      *perm_r; /* row permutations from partial pivoting */
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    SuperMatrix L;      /* factor L */
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    SCformat *Lstore;
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    SuperMatrix U;      /* factor U */
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    NCformat *Ustore;
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    SuperMatrix B;
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    int      nrhs, ldx, info, m, n, nnz;
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    double   *xact, *rhs;
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    mem_usage_t   mem_usage;
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    superlu_options_t options;
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    SuperLUStat_t stat;
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#if ( DEBUGlevel>=1 )
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    CHECK_MALLOC("Enter main()");
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#endif
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    /* Set the default input options:
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	options.Fact = DOFACT;
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        options.Equil = YES;
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    	options.ColPerm = COLAMD;
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	options.DiagPivotThresh = 1.0;
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    	options.Trans = NOTRANS;
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    	options.IterRefine = NOREFINE;
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    	options.SymmetricMode = NO;
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    	options.PivotGrowth = NO;
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    	options.ConditionNumber = NO;
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    	options.PrintStat = YES;
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     */
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    set_default_options(&options);
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    /* Read the matrix in Harwell-Boeing format. */
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    dreadhb(&m, &n, &nnz, &a, &asub, &xa);
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    dCreate_CompCol_Matrix(&A, m, n, nnz, a, asub, xa, SLU_NC, SLU_D, SLU_GE);
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    Astore = A.Store;
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    printf("Dimension %dx%d; # nonzeros %d\n", A.nrow, A.ncol, Astore->nnz);
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    nrhs   = 1;
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    if ( !(rhs = doubleMalloc(m * nrhs)) ) ABORT("Malloc fails for rhs[].");
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    dCreate_Dense_Matrix(&B, m, nrhs, rhs, m, SLU_DN, SLU_D, SLU_GE);
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    xact = doubleMalloc(n * nrhs);
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    ldx = n;
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    dGenXtrue(n, nrhs, xact, ldx);
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    dFillRHS(options.Trans, nrhs, xact, ldx, &A, &B);
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    if ( !(perm_c = intMalloc(n)) ) ABORT("Malloc fails for perm_c[].");
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    if ( !(perm_r = intMalloc(m)) ) ABORT("Malloc fails for perm_r[].");
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    /* Initialize the statistics variables. */
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    StatInit(&stat);
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    dgssv(&options, &A, perm_c, perm_r, &L, &U, &B, &stat, &info);
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    if ( info == 0 ) {
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	/* This is how you could access the solution matrix. */
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        double *sol = (double*) ((DNformat*) B.Store)->nzval; 
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	 /* Compute the infinity norm of the error. */
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	dinf_norm_error(nrhs, &B, xact);
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	Lstore = (SCformat *) L.Store;
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	Ustore = (NCformat *) U.Store;
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    	printf("No of nonzeros in factor L = %d\n", Lstore->nnz);
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    	printf("No of nonzeros in factor U = %d\n", Ustore->nnz);
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    	printf("No of nonzeros in L+U = %d\n", Lstore->nnz + Ustore->nnz - n);
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    	printf("FILL ratio = %.1f\n", (float)(Lstore->nnz + Ustore->nnz - n)/nnz);
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	dQuerySpace(&L, &U, &mem_usage);
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	printf("L\\U MB %.3f\ttotal MB needed %.3f\n",
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	       mem_usage.for_lu/1e6, mem_usage.total_needed/1e6);
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    } else {
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	printf("dgssv() error returns INFO= %d\n", info);
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	if ( info <= n ) { /* factorization completes */
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	    dQuerySpace(&L, &U, &mem_usage);
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	    printf("L\\U MB %.3f\ttotal MB needed %.3f\n",
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		   mem_usage.for_lu/1e6, mem_usage.total_needed/1e6);
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	}
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    }
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    if ( options.PrintStat ) StatPrint(&stat);
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    StatFree(&stat);
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    SUPERLU_FREE (rhs);
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    SUPERLU_FREE (xact);
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    SUPERLU_FREE (perm_r);
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    SUPERLU_FREE (perm_c);
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    Destroy_CompCol_Matrix(&A);
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    Destroy_SuperMatrix_Store(&B);
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    Destroy_SuperNode_Matrix(&L);
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    Destroy_CompCol_Matrix(&U);
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#if ( DEBUGlevel>=1 )
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    CHECK_MALLOC("Exit main()");
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#endif
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}
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