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fvn_sparse/UMFPACK/Source/umfpack_get_symbolic.c 4.02 KB
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422234dc3   daniau   git-svn-id: https... 
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  /* ========================================================================== */
  /* === UMFPACK_get_symbolic ================================================= */
  /* ========================================================================== */
  
  /* -------------------------------------------------------------------------- */
  /* UMFPACK Copyright (c) Timothy A. Davis, CISE,                              */
  /* Univ. of Florida.  All Rights Reserved.  See ../Doc/License for License.   */
  /* web: http://www.cise.ufl.edu/research/sparse/umfpack                       */
  /* -------------------------------------------------------------------------- */
  
  /*
      User-callable.  Gets the symbolic information held in the Symbolic object.
      See umfpack_get_symbolic.h for a more detailed description.
  */
  
  #include "umf_internal.h"
  #include "umf_valid_symbolic.h"
  
  GLOBAL Int UMFPACK_get_symbolic
  (
      Int *p_n_row,
      Int *p_n_col,
      Int *p_n1,			/* number of singletons */
      Int *p_nz,
      Int *p_nfr,
      Int *p_nchains,
      Int P [ ],
      Int Q [ ],
      Int Front_npivcol [ ],
      Int Front_parent [ ],
      Int Front_1strow [ ],
      Int Front_leftmostdesc [ ],
      Int Chain_start [ ],
      Int Chain_maxrows [ ],
      Int Chain_maxcols [ ],
      void *SymbolicHandle
  )
  {
      SymbolicType *Symbolic ;
      Int k, n_row, n_col, n1, nfr, nchains, *p ;
  
      /* ---------------------------------------------------------------------- */
      /* check inputs */
      /* ---------------------------------------------------------------------- */
  
      Symbolic = (SymbolicType *) SymbolicHandle ;
      if (!UMF_valid_symbolic (Symbolic))
      {
  	return (UMFPACK_ERROR_invalid_Symbolic_object) ;
      }
  
      /* ---------------------------------------------------------------------- */
      /* get contents of Symbolic */
      /* ---------------------------------------------------------------------- */
  
      n_row = Symbolic->n_row ;
      n_col = Symbolic->n_col ;
      n1 = Symbolic->n1 ;
      nfr = Symbolic->nfr ;
      nchains = Symbolic->nchains ;
  
      if (p_n_row)
      {
  	*p_n_row = n_row ;
      }
  
      if (p_n_col)
      {
  	*p_n_col = n_col ;
      }
  
      if (p_n1)
      {
  	*p_n1 = n1 ;
      }
  
      if (p_nz)
      {
  	*p_nz = Symbolic->nz ;
      }
  
      if (p_nfr)
      {
  	*p_nfr = nfr ;
      }
  
      if (p_nchains)
      {
  	*p_nchains = nchains ;
      }
  
      if (P != (Int *) NULL)
      {
  	Int *Rperm_init, *Diagonal_map ;
  	Rperm_init = Symbolic->Rperm_init ;
  	Diagonal_map = Symbolic->Diagonal_map ;
  	if (Diagonal_map != (Int *) NULL)
  	{
  	    ASSERT (n_row == n_col) ;
  	    /* next pivot rows are found in the diagonal map */
  	    for (k = 0 ; k < n_row ; k++)
  	    {
  		P [k] = Rperm_init [Diagonal_map [k]] ;
  	    }
  	}
  	else
  	{
  	    /* there is no diagonal map.  */
  	    for (k = 0 ; k < n_row ; k++)
  	    {
  		P [k] = Rperm_init [k] ;
  	    }
  	}
      }
  
      if (Q != (Int *) NULL)
      {
  	p = Symbolic->Cperm_init ;
  	for (k = 0 ; k < n_col ; k++)
  	{
  	    Q [k] = p [k] ;
  	}
      }
  
      if (Front_npivcol != (Int *) NULL)
      {
  	p = Symbolic->Front_npivcol ;
  	for (k = 0 ; k <= nfr ; k++)
  	{
  	    Front_npivcol [k] = p [k] ;
  	}
      }
  
      if (Front_parent != (Int *) NULL)
      {
  	p = Symbolic->Front_parent ;
  	for (k = 0 ; k <= nfr ; k++)
  	{
  	    Front_parent [k] = p [k] ;
  	}
      }
  
      if (Front_1strow != (Int *) NULL)
      {
  	p = Symbolic->Front_1strow ;
  	for (k = 0 ; k <= nfr ; k++)
  	{
  	    Front_1strow [k] = p [k] ;
  	}
      }
  
      if (Front_leftmostdesc != (Int *) NULL)
      {
  	p = Symbolic->Front_leftmostdesc ;
  	for (k = 0 ; k <= nfr ; k++)
  	{
  	    Front_leftmostdesc [k] = p [k] ;
  	}
      }
  
      if (Chain_start != (Int *) NULL)
      {
  	p = Symbolic->Chain_start ;
  	for (k = 0 ; k <= nchains ; k++)
  	{
  	    Chain_start [k] = p [k] ;
  	}
      }
  
      if (Chain_maxrows != (Int *) NULL)
      {
  	p = Symbolic->Chain_maxrows ;
  	for (k = 0 ; k < nchains ; k++)
  	{
  	    Chain_maxrows [k] = p [k] ;
  	}
  	Chain_maxrows [nchains] = 0 ;
      }
  
      if (Chain_maxcols != (Int *) NULL)
      {
  	p = Symbolic->Chain_maxcols ;
  	for (k = 0 ; k < nchains ; k++)
  	{
  	    Chain_maxcols [k] = p [k] ;
  	}
  	Chain_maxcols [nchains] = 0 ;
      }
  
      return (UMFPACK_OK) ;
  }