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////////////////////////////////////////////////////////////////////////////////
//
// Cocircuits.cc
//
// produced: 12/09/2006 jr
// last change: 12/09/2006 jr
//
////////////////////////////////////////////////////////////////////////////////
#include <iostream>
#include <ctype.h>
#include <string.h>
#include <assert.h>
#include "Cocircuits.hh"
namespace topcom {
// Cocircuit:
Cocircuit::Cocircuit(const Chirotope& chiro, const dependent_set_type& coplanar_set) {
assert(coplanar_set.card() == chiro.rank() - 1);
basis_type basis(coplanar_set);
int pm(0);
bool found_nonzero(false);
LabelSet universe(0, chiro.no());
for (LabelSet::iterator iter = universe.begin();
iter != universe.end();
++iter) {
if (coplanar_set.contains(*iter)) {
pm = -pm;
}
else {
basis += *iter;
if (CommandlineOptions::debug()) {
std::cerr << "chiro(" << basis << ") = " << std::endl;
}
int chiro_on_basis = chiro(basis);
if (CommandlineOptions::debug()) {
std::cerr << chiro_on_basis << std::endl;
}
if (!found_nonzero && (chiro_on_basis != 0)) {
found_nonzero = true;
pm = chiro_on_basis;
first += *iter;
}
else {
if (chiro_on_basis * pm > 0) {
first += *iter;
}
else if (chiro_on_basis * pm < 0) {
second += *iter;
}
}
basis -= *iter;
}
}
}
// Cocircuits:
Cocircuits::Cocircuits(const Chirotope& chiro, const bool only_positive) :
cocircuits_data(), _no(chiro.no()), _rank(chiro.rank()) {
size_type count(0);
// if (_no == _rank) {
// return;
// }
Permutation coplanar_perm(_no, _rank - 1);
do {
dependent_set_type coplanar_set(coplanar_perm);
if (CommandlineOptions::debug()) {
std::cerr << "computing";
if (only_positive) {
std::cerr << " positive ";
}
std::cerr << " sign vectors from spanning "
<< _rank - 1 << "-subset "
<< coplanar_set
<< " ..."
<< std::endl;
}
Cocircuit cocircuit(chiro, coplanar_set);
if (CommandlineOptions::debug()) {
std::cerr << "... done." << std::endl;
std::cerr << "result: " << cocircuit << std::endl;
}
if ((only_positive) && !cocircuit.first.empty() && !cocircuit.second.empty()) {
continue;
}
if (!cocircuit.first.empty() || !cocircuit.second.empty()) {
(*this)[cocircuit.first + cocircuit.second] = cocircuit;
if (CommandlineOptions::verbose() && (++count % 10000 == 0)) {
std::cerr << size();
if (only_positive) {
std::cerr << " positive";
}
std::cerr << " cocircuits computed so far." << std::endl;
}
}
} while (coplanar_perm.lexnext());
if (CommandlineOptions::verbose()) {
std::cerr << size() << " cocircuits in total." << std::endl;
}
}
// stream output/input:
std::ostream& Cocircuits::print_string(std::ostream& ost) const {
ost << _no << ',' << _rank << ':' << std::endl;
ost << '{' << std::endl;
for (const_iterator iter = begin(); iter != end(); ++iter) {
#ifndef STL_CONTAINERS
ost << '[' << iter->dataptr()->first << ',' << iter->dataptr()->second << ']' << '\n';
#else
ost << '[' << iter->second.first << ',' << iter->second.second << ']' << '\n';
#endif
}
ost << '}' << std::endl;
return ost;
}
std::istream& Cocircuits::read_string(std::istream& ist) {
char c;
Cocircuit cocircuit;
clear();
if (!(ist >> std::ws >> _no)) {
#ifdef READ_DEBUG
std::cerr << "Cocircuits::read_string(std::istream&): "
<< "number of points not found." << std::endl;
#endif
ist.clear(std::ios::failbit);
return ist;
}
if (!(ist >> std::ws >> c)) {
#ifdef READ_DEBUG
std::cerr << "Cocircuits::read_string(std::istream&): "
<< "separator not found." << std::endl;
#endif
ist.clear(std::ios::failbit);
return ist;
}
if (!(ist >> std::ws >> _rank)) {
#ifdef READ_DEBUG
std::cerr << "Cocircuits::read_string(std::istream&): "
<< "rank not found." << std::endl;
#endif
ist.clear(std::ios::failbit);
return ist;
}
if (!(ist >> std::ws >> c)) {
#ifdef READ_DEBUG
std::cerr << "Cocircuits::read_string(std::istream&): "
<< "separator not found." << std::endl;
#endif
ist.clear(std::ios::failbit);
return ist;
}
while (ist >> std::ws >> c) {
if (c == '{') {
continue;
}
else if (c == '}') {
break;
}
else {
ist.putback(c);
if (ist >> cocircuit) {
(*this)[cocircuit.first + cocircuit.second] = cocircuit;
}
else {
#ifdef READ_DEBUG
std::cerr << "Cocircuits::read_string(std::istream&): "
<< "not of appropriate type." << std::endl;
#endif
ist.clear(std::ios::failbit);
return ist;
}
}
}
return ist;
}
}; // namespace topcom
// eof Cocircuits.cc
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