LA_library/sparsesmat.cc
2021-04-21 13:04:37 +00:00

369 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/>.
*/
#include <string>
#include <cmath>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include "sparsesmat.h"
namespace LA {
//dense times sparse (not necessarily symmetric)
template <typename T>
SparseSMat<T> NRMat<T>::operator*(const SparseSMat<T> &rhs) const
{
SparseSMat<T> r(nn,rhs.ncols());
if(mm!=rhs.nrows()) laerror("incompatible sizes in NRMat*SparseSMat");
for(SPMatindex k=0; k<mm; ++k) //summation loop
{
std::map<SPMatindex,T> * kl = rhs.line(k);
if(kl)
{
//gather the data
typename std::map<SPMatindex,T>::iterator p;
int i,j;
NRVec<T> kline(kl->size());
NRVec<SPMatindex> klineind(kl->size());
for(p=kl->begin(), i=0; p!=kl->end(); ++p,++i)
{
klineind[i] = p->first;
kline[i] = p->second;
}
NRVec<T> kcol = column(k);
//multiply
NRMat<T> prod=kcol.otimes(kline,false,1.);
//scatter the results
for(i=0; i<prod.nrows(); ++i) for(j=0; j<prod.ncols(); ++j)
add(i,klineind[j],prod(i,j),false);
}
}
r.simplify();
return r;
}
//matrix is assummed symmetric, no transposition, but possibly make conjugation
template <typename T>
void SparseSMat<T>::gemm(const T beta, const SparseSMat &a, const char transa, const SparseSMat &b, const char transb, const T alpha)
{
(*this) *= beta;
if(alpha==(T)0) return;
if(a.nn!=a.mm || b.nn!=b.mm || nn!=mm) laerror("SparseSMat::gemm implemented only for square symmetric matrices");
if(a.nn!=b.nn || a.nn!=nn) laerror("incompatible sizes in SparseSMat::gemm");
copyonwrite();
for(SPMatindex k=0; k<nn; ++k) //summation loop
if(a.v[k] && b.v[k]) //nonempty in both
{
NRVec<T> av(a.v[k]->size());
NRVec<T> bv(b.v[k]->size());
NRVec<SPMatindex> ai(a.v[k]->size());
NRVec<SPMatindex> bi(b.v[k]->size());
//gather the data
typename std::map<SPMatindex,T>::iterator p;
int i,j;
if(tolower(transa)=='c')
for(p=a.v[k]->begin(), i=0; p!=a.v[k]->end(); ++p,++i) { ai[i] = p->first; av[i] = LA_traits<T>::conjugate(p->second); }
else
for(p=a.v[k]->begin(), i=0; p!=a.v[k]->end(); ++p,++i) { ai[i] = p->first; av[i] = p->second; }
for(p=b.v[k]->begin(), i=0; p!=b.v[k]->end(); ++p,++i) { bi[i] = p->first; bv[i] = p->second; }
//make multiply via blas
NRMat<T> prod=av.otimes(bv,tolower(transb)=='c',alpha);
//scatter the results -- probably the computational bottleneck
for(i=0; i<prod.nrows(); ++i) for(j=0; j<prod.ncols(); ++j)
add(ai[i],bi[j],prod(i,j),false);
}
simplify();
}
template <class T>
SparseSMat<T> & SparseSMat<T>::operator*=(const T &a)
{
if(!count) laerror("operator*= on undefined lhs");
if(a==(T)1) return *this;
if(a==(T)0) {clear(); return *this;}
copyonwrite();
for(SPMatindex i=0; i<nn; ++i) if(v[i])
{
typename std::map<SPMatindex,T>::iterator p;
for(p=v[i]->begin(); p!=v[i]->end(); ++p) p->second *= a;
}
return *this;
}
template <class T>
void SparseSMat<T>::axpy(const T alpha, const SparseSMat &x, const bool transp)
{
if(nn!=x.nn || mm!=x.mm) laerror("incompatible matrix dimensions in SparseSMat::axpy");
if(alpha==(T)0) return;
copyonwrite();
for(SPMatindex i=0; i<nn; ++i) if(x.v[i])
{
if(!v[i]) v[i] = new std::map<SPMatindex,T>;
typename std::map<SPMatindex,T>::iterator p,q;
for(p=x.v[i]->begin(); p!=x.v[i]->end(); ++p)
{
q=v[i]->find(p->first);
if(q!=v[i]->end()) q->second += p->second * alpha;
else (*v[i])[p->first] = p->second * alpha;
}
}
simplify();
}
template <class T>
void SparseSMat<T>::gemv(const T beta, NRVec<T> &r, const char trans, const T alpha, const NRVec<T> &x) const
{
if(nn!=r.size() || mm!= x.size()) laerror("incompatible matrix vector dimensions in SparseSMat::gemv");
if(tolower(trans)!='n') laerror("transposition not implemented yet in SparseSMat::gemv");
r *= beta;
if(alpha == (T)0) return;
r.copyonwrite();
for(SPMatindex i=0; i<nn; ++i) if(v[i])
{
typename std::map<SPMatindex,T>::iterator p;
for(p=v[i]->begin(); p!=v[i]->end(); ++p) r[i] += x[p->first] * p->second * alpha ;
}
}
template <class T>
SparseSMat<T> & SparseSMat<T>::operator=(const T &a)
{
clear();
for(SPMatindex i=0; i<nn; ++i)
{
if(!v[i]) v[i] = new std::map<SPMatindex,T>;
(*v[i])[i] = a;
}
return *this;
}
template <class T>
SparseSMat<T> & SparseSMat<T>::operator+=(const T &a)
{
copyonwrite();
for(SPMatindex i=0; i<nn; ++i)
{
if(v[i])
{
typename std::map<SPMatindex,T>::iterator p;
p= v[i]->find(i);
if(p!=v[i]->end()) p->second+=a; else (*v[i])[i] = a;
}
else {v[i] = new std::map<SPMatindex,T>; (*v[i])[i] = a;}
}
return *this;
}
template <class T>
SparseSMat<T> & SparseSMat<T>::operator-=(const T &a)
{
copyonwrite();
for(SPMatindex i=0; i<nn; ++i)
{
if(v[i])
{
typename std::map<SPMatindex,T>::iterator p;
p= v[i]->find(i);
if(p!=v[i]->end()) p->second-=a; else (*v[i])[i] = -a;
}
else {v[i] = new std::map<SPMatindex,T>; (*v[i])[i] = -a;}
}
return *this;
}
template <class T>
typename LA_traits<T>::normtype SparseSMat<T>::norm(const T scalar) const
{
typename LA_traits<T>::normtype sum=0;
for(SPMatindex i=0; i<nn; ++i)
if(v[i]) //line present
{
typename std::map<SPMatindex,T>::iterator p;
bool diagonal_present=false;
for(p=v[i]->begin(); p!=v[i]->end(); ++p) //loop over all existing elements
{
if(i==p->first) {diagonal_present=true; sum += LA_traits<T>::sqrabs(p->second - scalar);}
else sum += LA_traits<T>::sqrabs(p->second);
}
if(!diagonal_present) sum += LA_traits<T>::sqrabs(scalar); //there was zero on the diagonal
}
else sum += LA_traits<T>::sqrabs(scalar); //missing whole line, subtracted diagonal element contributes
return std::sqrt(sum);
}
//get diagonal, do not construct a new object, but store in existing one
template <class T>
const T* SparseSMat<T>::diagonalof(NRVec<T> &r, const bool divide, bool cache) const
{
if(nn!=mm) laerror("non-square matrix in SparseSMat::diagonalof");
if(nn!=r.size()) laerror("incompatible vector size in diagonalof()");
NRVec<T> *rr;
r.copyonwrite();
if(divide) {rr=new NRVec<T>(nn); *rr=(T)0;}
else {r=(T)0; rr=&r;}
for(SPMatindex i=0; i<nn; ++i)
if(v[i])
{
typename std::map<SPMatindex,T>::iterator p;
p= v[i]->find(i);
if(p!=v[i]->end()) (*rr)[i] += p->second;
}
if(divide)
{
for(unsigned int i=0; i<nn; ++i) if((*rr)[i]!=0.) r[i]/=(*rr)[i];
delete rr;
}
return divide?NULL:&r[0];
}
template <class T>
SparseSMat<T> SparseSMat<T>::submatrix(const int fromrow, const int torow, const int fromcol, const int tocol) const
{
#ifdef DEBUG
if(fromrow<0 || fromrow>=nn|| torow<0 || torow>=nn || fromcol<0 || fromcol>=mm || tocol<0 || tocol>=mm || fromrow>torow || fromcol>tocol){
laerror("invalid submatrix specification");
}
#endif
const int m = tocol - fromcol + 1;
const int n = torow - fromrow + 1;
SparseSMat<T> result(n, m);
typename SparseSMat<T>::iterator p(*this);
for(; p.notend(); ++p)
if(p->row>=fromrow && p->row<= torow && p->col >= fromcol && p->col <= tocol)
result.add(p->row-fromrow, p->col-fromcol, p->elem, false);
return result;
}
template <class T>
void SparseSMat<T>::storesubmatrix(const int fromrow, const int fromcol, const SparseSMat<T> &rhs)
{
const int tocol = fromcol + rhs.ncols() - 1;
const int torow = fromrow + rhs.nrows() - 1;
#ifdef DEBUG
if(fromrow<0 || fromrow>=nn || torow>=nn || fromcol<0 || fromcol>=mm || tocol>=mm) laerror("bad indices in storesubmatrix");
#endif
typename SparseSMat<T>::iterator p(rhs);
for(; p.notend(); ++p) add(p->row+fromrow, p->col+fromcol, p->elem, false);
}
template <class T>
void SparseSMat<T>::get(int fd, bool dimen, bool transp) {
errno=0;
SPMatindex dim[2];
if(dimen) {
if(2*sizeof(SPMatindex)!=read(fd,&dim,2*sizeof(SPMatindex))) laerror("read() error in SparseSMat::get ");
resize(dim[0],dim[1]);
}
else copyonwrite();
do {
if(2*sizeof(SPMatindex)!=read(fd,&dim,2*sizeof(SPMatindex))) laerror("read() error 2 in SparseSMat::get");
if(dim[0]==(SPMatindex) -1 || dim[1]==(SPMatindex) -1) break;
typename LA_traits_io<T>::IOtype tmp;
LA_traits<T>::get(fd,tmp,dimen,transp); // general way to work when elem is some complex class again
if(transp) add(dim[0],dim[1],tmp,false); else add(dim[1],dim[0],tmp,false);
}
while(1);
}
template <class T>
void SparseSMat<T>::put(int fd, bool dimen, bool transp) const {
errno=0;
if(dimen) {
if(sizeof(SPMatindex)!=write(fd,&nn,sizeof(SPMatindex))) laerror("cannot write() 1 in SparseSMat::put");
if(sizeof(SPMatindex)!=write(fd,&mm,sizeof(SPMatindex))) laerror("cannot write() 2 in SparseSMat::put");
}
typename SparseSMat<T>::iterator p(*this);
for(; p.notend(); ++p) {
if(sizeof(SPMatindex)!=write(fd,&(p->row),sizeof(SPMatindex))) laerror("cannot write() 3 in SparseSMat::put");
if(sizeof(SPMatindex)!=write(fd,&(p->col),sizeof(SPMatindex))) laerror("cannot write() 4 in SparseSMat::put");
typename LA_traits_io<T>::IOtype tmp = p->elem;
LA_traits<T>::put(fd,tmp,dimen,transp); // general way to work when elem is some non-scalar class again
}
SPMatindex sentinel[2];
sentinel[0] = sentinel[1] = (SPMatindex) -1;
if(2*sizeof(SPMatindex) != write(fd,&sentinel,2*sizeof(SPMatindex))) laerror("cannot write() 5 in SparseSMat::put");
}
/* Commented out by Roman for ICC
#define INSTANTIZE(T) \
template void SparseSMat<T>::gemm(const T beta, const SparseSMat &a, const char transa, const SparseSMat &b, const char transb, const T alpha); \
template SparseSMat<T> & SparseSMat<T>::operator*=(const T &a); \
template void SparseSMat<T>::gemv(const T beta, NRVec<T> &r, const char trans, const T alpha, const NRVec<T> &x) const; \
template void SparseSMat<T>::axpy(const T alpha, const SparseSMat &x, const bool transp); \
template SparseSMat<T> & SparseSMat<T>::operator=(const T &a); \
template SparseSMat<T> & SparseSMat<T>::operator+=(const T &a); \
template SparseSMat<T> & SparseSMat<T>::operator-=(const T &a); \
template LA_traits<T>::normtype SparseSMat<T>::norm(const T scalar) const; \
template const T* SparseSMat<T>::diagonalof(NRVec<T> &r, const bool divide, bool cache) const; \
template void SparseSMat<T>::get(int fd, bool dimen, bool transp); \
template void SparseSMat<T>::put(int fd, bool dimen, bool transp) const; \
INSTANTIZE(double)
INSTANTIZE(complex<double>)
*/
//// forced instantization of functions in the header in the corresponding object file
template class SparseSMat<double>;
template class SparseSMat<std::complex<double> >;
/*activate this if needed
template void SparseSMat<NRMat<double> >::put(int fd, bool dimen, bool transp) const;
template void SparseSMat<NRMat<double> >::get(int fd, bool dimen, bool transp);
*/
}//namespace