LA_library/sparsemat.h
2013-11-04 14:56:39 +00:00

308 lines
11 KiB
C++

/*
LA: linear algebra C++ interface library
Copyright (C) 2008 Jiri Pittner <jiri.pittner@jh-inst.cas.cz> or <jiri@pittnerovi.com>
This program is free software: 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 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _SPARSEMAT_H_
#define _SPARSEMAT_H_
#include "la_traits.h"
namespace LA {
//threshold for neglecting elements, if not defined, no tests are done except exact zero test in simplify - might be even faster
//seems to perform better with a threshold, in spite of abs() tests
const double SPARSEEPSILON=1e-35;
typedef unsigned int SPMatindex;
typedef int SPMatindexdiff; //more clear would be to use traits
//element of a linked list
template<typename T>
struct matel
{
T elem;
SPMatindex row;
SPMatindex col;
matel *next;
};
template <typename T>
class SparseMat {
protected:
SPMatindex nn;
SPMatindex mm;
bool symmetric;
unsigned int nonzero;
int *count;
matel<T> *list;
private:
matel<T> **rowsorted; //NULL terminated
matel<T> **colsorted; //NULL terminated
void unsort();
void deletelist();
void copylist(const matel<T> *l);
public:
//iterator
class iterator {
private:
matel<T> *p;
public:
iterator() {};
~iterator() {};
iterator(matel<T> *list): p(list) {};
bool operator==(const iterator rhs) const {return p==rhs.p;}
bool operator!=(const iterator rhs) const {return p!=rhs.p;}
iterator operator++() {return p=p->next;}
iterator operator++(int) {matel<T> *q=p; p=p->next; return q;}
matel<T> & operator*() const {return *p;}
matel<T> * operator->() const {return p;}
};
iterator begin() const {return list;}
iterator end() const {return NULL;}
//constructors etc.
inline SparseMat() :nn(0),mm(0),symmetric(0),nonzero(0),count(NULL),list(NULL),rowsorted(NULL),colsorted(NULL) {};
inline SparseMat(const SPMatindex n, const SPMatindex m) :nn(n),mm(m),symmetric(0),nonzero(0),count(new int(1)),list(NULL),rowsorted(NULL),colsorted(NULL) {};
SparseMat(const SparseMat &rhs); //copy constructor
inline int getcount() const {return count?*count:0;}
explicit SparseMat(const NRMat<T> &rhs); //construct from a dense one
explicit SparseMat(const NRSMat<T> &rhs); //construct from a dense symmetric one
SparseMat & operator=(const SparseMat &rhs);
SparseMat & operator=(const T &a); //assign a to diagonal
SparseMat & operator+=(const T &a); //assign a to diagonal
SparseMat & operator-=(const T &a); //assign a to diagonal
SparseMat & operator*=(const T &a); //multiply by a scalar
SparseMat & operator+=(const SparseMat &rhs);
SparseMat & addtriangle(const SparseMat &rhs, const bool lower, const char sign);
SparseMat & join(SparseMat &rhs); //more efficient +=, rhs will be emptied
SparseMat & operator-=(const SparseMat &rhs);
inline const SparseMat operator+(const T &rhs) const {return SparseMat(*this) += rhs;}
inline const SparseMat operator-(const T &rhs) const {return SparseMat(*this) -= rhs;}
inline const SparseMat operator*(const T &rhs) const {return SparseMat(*this) *= rhs;}
inline const SparseMat operator+(const SparseMat &rhs) const {return SparseMat(*this) += rhs;} //must not be symmetric+general
inline const SparseMat operator-(const SparseMat &rhs) const {return SparseMat(*this) -= rhs;} //must not be symmetric+general
inline const NRVec<T> operator*(const NRVec<T> &rhs) const; // SparseMat * Vec
inline const NRMat<T> operator*(const NRMat<T> &rhs) const; // SparseMat * Mat
const T* diagonalof(NRVec<T> &, const bool divide=0, bool cache=false) const; //get diagonal
void gemv(const T beta, NRVec<T> &r, const char trans, const T alpha, const NRVec<T> &x, bool treat_as_symmetric=false) const {r.gemv(beta,*this,trans,alpha,x,treat_as_symmetric);};
const SparseMat operator*(const SparseMat &rhs) const;
SparseMat & oplusequal(const SparseMat &rhs); //direct sum
SparseMat & oplusequal(const NRMat<T> &rhs);
SparseMat & oplusequal(const NRSMat<T> &rhs);
const SparseMat oplus(const SparseMat &rhs) const {return SparseMat(*this).oplusequal(rhs);}; //direct sum
const SparseMat oplus(const NRMat<T> &rhs) const {return SparseMat(*this).oplusequal(rhs);};
const SparseMat oplus(const NRSMat<T> &rhs) const {return SparseMat(*this).oplusequal(rhs);};
const SparseMat otimes(const SparseMat &rhs) const; //direct product
const SparseMat otimes(const NRMat<T> &rhs) const;
const SparseMat otimes(const NRSMat<T> &rhs) const;
void gemm(const T beta, const SparseMat &a, const char transa, const SparseMat &b, const char transb, const T alpha);//this := alpha*op( A )*op( B ) + beta*this, if this is symemtric, only half will be added onto it
const T dot(const SparseMat &rhs) const; //supervector dot product
const T dot(const NRMat<T> &rhs) const; //supervector dot product
inline ~SparseMat();
void axpy(const T alpha, const SparseMat &x, const bool transp=0); // this+= a*x(transposed)
inline matel<T> *getlist() const {return list;}
void setlist(matel<T> *l) {list=l;}
inline SPMatindex nrows() const {return nn;}
inline SPMatindex ncols() const {return mm;}
void get(int fd, bool dimensions=1, bool transposed=false);
void put(int fd, bool dimensions=1, bool transposed=false) const;
void resize(const SPMatindex n, const SPMatindex m); //destructive
void dealloc(void) {resize(0,0);}
void incsize(const SPMatindex n, const SPMatindex m); //increase size without destroying the data
void transposeme();
const SparseMat transpose() const;
void permuteindices(const NRVec<SPMatindex> &p);
void permuterows(const NRVec<SPMatindex> &p);
void permutecolumns(const NRVec<SPMatindex> &p);
inline void setsymmetric() {if(nn!=mm) laerror("non-square cannot be symmetric"); symmetric=1;}
inline void defineunsymmetric() {symmetric=0;} //just define and do nothing with it
void setunsymmetric();//unwind the matrix assuming it was indeed symmetric
inline bool issymmetric() const {return symmetric;}
unsigned int length() const;
void copyonwrite(bool detachonly=false);
void clear() {copyonwrite(true); if(count) {delete count; count=NULL;}}
void simplify();
const T trace() const;
const typename LA_traits<T>::normtype norm(const T scalar=(T)0) const; //is const only mathematically, not in internal implementation - we have to simplify first
unsigned int sort(int type) const;
inline void add(const SPMatindex n, const SPMatindex m, const T elem) {matel<T> *ltmp= new matel<T>; ltmp->next=list; list=ltmp; list->row=n; list->col=m; list->elem=elem;}
void addsafe(const SPMatindex n, const SPMatindex m, const T elem);
};
}//namespace
//due to mutual includes this has to be after full class declaration
#include "vec.h"
#include "smat.h"
#include "mat.h"
namespace LA {
template <typename T>
inline const NRVec<T> SparseMat<T>::operator*(const NRVec<T> &rhs) const
{NRVec<T> result(nn); result.gemv((T)0,*this,'n',(T)1,rhs); return result;};
template <typename T>
inline const NRMat<T> SparseMat<T>::operator*(const NRMat<T> &rhs) const
{NRMat<T> result(nn,rhs.ncols()); result.gemm((T)0,*this,'n',rhs,'n',(T)1); return result;};
template <class T>
std::ostream& operator<<(std::ostream &s, const SparseMat<T> &x)
{
SPMatindex n,m;
n=x.nrows();
m=x.ncols();
s << (int)n << ' ' << (int)m << '\n';
matel<T> *list=x.getlist();
while(list)
{
s << (int)list->row << ' ' << (int)list->col << ' ' << (typename LA_traits_io<T>::IOtype)list->elem << '\n';
list=list->next;
}
s << "-1 -1\n";
return s;
}
template <class T>
std::istream& operator>>(std::istream &s, SparseMat<T> &x)
{
int i,j;
int n,m;
matel<T> *l=NULL;
s >> n >> m;
x.resize(n,m);
s >> i >> j;
while(i>=0 && j>=0)
{
matel<T> *ll = l;
l= new matel<T>;
l->next= ll;
l->row=i;
l->col=j;
typename LA_traits_io<T>::IOtype tmp;
s >> tmp;
l->elem=tmp;
s >> i >> j;
}
x.setlist(l);
return s;
}
//destructor
template <typename T>
SparseMat<T>::~SparseMat()
{
unsort();
if(!count) return;
if(--(*count)<=0)
{
deletelist();
delete count;
}
}
//copy constructor (sort arrays are not going to be copied)
template <typename T>
SparseMat<T>::SparseMat(const SparseMat<T> &rhs)
{
#ifdef debug
if(! &rhs) laerror("SparseMat copy constructor with NULL argument");
#endif
nn=rhs.nn;
mm=rhs.mm;
symmetric=rhs.symmetric;
if(rhs.list&&!rhs.count) laerror("some inconsistency in SparseMat contructors or assignments");
list=rhs.list;
if(list) {count=rhs.count; (*count)++;} else count=new int(1); //make the matrix defined, but empty and not shared
colsorted=rowsorted=NULL;
nonzero=0;
}
template <typename T>
const SparseMat<T> SparseMat<T>::transpose() const
{
if(list&&!count) laerror("some inconsistency in SparseMat transpose");
SparseMat<T> result;
result.nn=mm;
result.mm=nn;
result.symmetric=symmetric;
if(result.symmetric)
{
result.list=list;
if(list) {result.count=count; (*result.count)++;} else result.count=new int(1); //make the matrix defined, but empty and not shared
}
else //really transpose it
{
result.count=new int(1);
result.list=NULL;
matel<T> *l =list;
while(l)
{
result.add(l->col,l->row,l->elem);
l=l->next;
}
}
result.colsorted=result.rowsorted=NULL;
result.nonzero=0;
return result;
}
template<typename T>
inline const SparseMat<T> commutator ( const SparseMat<T> &x, const SparseMat<T> &y, const bool trx=0, const bool tryy=0)
{
SparseMat<T> r;
r.gemm((T)0,x,trx?'t':'n',y,tryy?'t':'n',(T)1);
r.gemm((T)1,y,tryy?'t':'n',x,trx?'t':'n',(T)-1); //saves a temporary and simplifies the whole sum
return r;
}
template<typename T>
inline const SparseMat<T> anticommutator ( const SparseMat<T> &x, const SparseMat<T> &y, const bool trx=0, const bool tryy=0)
{
SparseMat<T> r;
r.gemm((T)0,x,trx?'t':'n',y,tryy?'t':'n',(T)1);
r.gemm((T)1,y,tryy?'t':'n',x,trx?'t':'n',(T)1); //saves a temporary and simplifies the whole sum
return r;
}
//add sparse to dense
template<typename T>
NRMat<T> & NRMat<T>::operator+=(const SparseMat<T> &rhs)
{
if((unsigned int)nn!=rhs.nrows()||(unsigned int)mm!=rhs.ncols()) laerror("incompatible matrices in +=");
matel<T> *l=rhs.getlist();
bool sym=rhs.issymmetric();
while(l)
{
#ifdef MATPTR
v[l->row][l->col] +=l->elem;
if(sym && l->row!=l->col) v[l->col][l->row] +=l->elem;
#else
v[l->row*mm+l->col] +=l->elem;
if(sym && l->row!=l->col) v[l->col*mm+l->row] +=l->elem;
#endif
l=l->next;
}
return *this;
}
}//namespace
#endif