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// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2012 Désiré Nuentsa-Wakam <desire.nuentsa_wakam@inria.fr>
//
// Eigen is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 3 of the License, or (at your option) any later version.
//
// Alternatively, 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.
//
// Eigen 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 Lesser General Public License or the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License and a copy of the GNU General Public License along with
// Eigen. If not, see <http://www.gnu.org/licenses/>.
/*
* NOTE: Part of this file is the modified version of files slu_[s,d,c,z]defs.h
* -- SuperLU routine (version 4.1) --
* Univ. of California Berkeley, Xerox Palo Alto Research Center,
* and Lawrence Berkeley National Lab.
* November, 2010
*
* Global data structures used in LU factorization -
*
* nsuper: #supernodes = nsuper + 1, numbered [0, nsuper].
* (xsup,supno): supno[i] is the supernode no to which i belongs;
* xsup(s) points to the beginning of the s-th supernode.
* e.g. supno 0 1 2 2 3 3 3 4 4 4 4 4 (n=12)
* xsup 0 1 2 4 7 12
* Note: dfs will be performed on supernode rep. relative to the new
* row pivoting ordering
*
* (xlsub,lsub): lsub[*] contains the compressed subscript of
* rectangular supernodes; xlsub[j] points to the starting
* location of the j-th column in lsub[*]. Note that xlsub
* is indexed by column.
* Storage: original row subscripts
*
* During the course of sparse LU factorization, we also use
* (xlsub,lsub) for the purpose of symmetric pruning. For each
* supernode {s,s+1,...,t=s+r} with first column s and last
* column t, the subscript set
* lsub[j], j=xlsub[s], .., xlsub[s+1]-1
* is the structure of column s (i.e. structure of this supernode).
* It is used for the storage of numerical values.
* Furthermore,
* lsub[j], j=xlsub[t], .., xlsub[t+1]-1
* is the structure of the last column t of this supernode.
* It is for the purpose of symmetric pruning. Therefore, the
* structural subscripts can be rearranged without making physical
* interchanges among the numerical values.
*
* However, if the supernode has only one column, then we
* only keep one set of subscripts. For any subscript interchange
* performed, similar interchange must be done on the numerical
* values.
*
* The last column structures (for pruning) will be removed
* after the numercial LU factorization phase.
*
* (xlusup,lusup): lusup[*] contains the numerical values of the
* rectangular supernodes; xlusup[j] points to the starting
* location of the j-th column in storage vector lusup[*]
* Note: xlusup is indexed by column.
* Each rectangular supernode is stored by column-major
* scheme, consistent with Fortran 2-dim array storage.
*
* (xusub,ucol,usub): ucol[*] stores the numerical values of
* U-columns outside the rectangular supernodes. The row
* subscript of nonzero ucol[k] is stored in usub[k].
* xusub[i] points to the starting location of column i in ucol.
* Storage: new row subscripts; that is subscripts of PA.
*/
#ifndef EIGEN_LU_STRUCTS
#define EIGEN_LU_STRUCTS
namespace Eigen {
#define NO_MEMTYPE 4 /* 0: lusup
1: ucol
2: lsub
3: usub */
typedef enum {NATURAL, MMD_ATA, MMD_AT_PLUS_A, COLAMD, MY_PREMC} colperm_t;
typedef enum {DOFACT, SamePattern, SamePattern_SameRowPerm, Factored} fact_t;
typedef enum {LUSUP, UCOL, LSUB, USUB, LLVL, ULVL} MemType;
/** Headers for dynamically managed memory
\tparam BaseType can be int, real scalar or complex scalar*/
template <typename BaseType>
struct ExpHeader {
int size; // Length of the memory that has been used */
BaseType *mem;
} ExpHeader;
template <typename VectorType, typename Index>
struct {
VectorXi xsup; // supernode and column mapping
VectorXi supno; // Supernode number corresponding to this column
VectorXi lsub; // Compressed L subscripts of rectangular supernodes
VectorXi xlsub; // xlsub(j) points to the starting location of the j-th column in lsub
VectorXi xlusup;
VectorXi xusub;
VectorType lusup; // L supernodes
VectorType ucol; // U columns
Index nzlmax; // Current max size of lsub
Index nzumax; // Current max size of ucol
Index nzlumax; // Current max size of lusup
Index n; // Number of columns in the matrix
int num_expansions;
ExpHeader *expanders; // Array of pointers to 4 types of memory
} GlobalLU_t;
}// End namespace Eigen
#endif
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