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/* This file is part of the Gudhi Library. The Gudhi library
* (Geometric Understanding in Higher Dimensions) is a generic C++
* library for computational topology.
*
* Author(s): Vincent Rouvreau
*
* Copyright (C) 2016 INRIA
*
* 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 INCLUDE_PERSISTENT_COHOMOLOGY_INTERFACE_H_
#define INCLUDE_PERSISTENT_COHOMOLOGY_INTERFACE_H_
#include <gudhi/Persistent_cohomology.h>
#include <vector>
#include <utility> // for std::pair
#include <algorithm> // for sort
namespace Gudhi {
template<class FilteredComplex>
class Persistent_cohomology_interface : public
persistent_cohomology::Persistent_cohomology<FilteredComplex, persistent_cohomology::Field_Zp> {
private:
/*
* Compare two intervals by dimension, then by length.
*/
struct cmp_intervals_by_dim_then_length {
explicit cmp_intervals_by_dim_then_length(FilteredComplex * sc)
: sc_(sc) { }
template<typename Persistent_interval>
bool operator()(const Persistent_interval & p1, const Persistent_interval & p2) {
if (sc_->dimension(get < 0 > (p1)) == sc_->dimension(get < 0 > (p2)))
return (sc_->filtration(get < 1 > (p1)) - sc_->filtration(get < 0 > (p1))
> sc_->filtration(get < 1 > (p2)) - sc_->filtration(get < 0 > (p2)));
else
return (sc_->dimension(get < 0 > (p1)) > sc_->dimension(get < 0 > (p2)));
}
FilteredComplex* sc_;
};
public:
Persistent_cohomology_interface(FilteredComplex* stptr)
: persistent_cohomology::Persistent_cohomology<FilteredComplex, persistent_cohomology::Field_Zp>(*stptr),
stptr_(stptr) { }
Persistent_cohomology_interface(FilteredComplex* stptr, bool persistence_dim_max)
: persistent_cohomology::Persistent_cohomology<FilteredComplex,
persistent_cohomology::Field_Zp>(*stptr, persistence_dim_max),
stptr_(stptr) { }
std::vector<std::pair<int, std::pair<double, double>>> get_persistence(int homology_coeff_field,
double min_persistence) {
persistent_cohomology::Persistent_cohomology<FilteredComplex,
persistent_cohomology::Field_Zp>::init_coefficients(homology_coeff_field);
persistent_cohomology::Persistent_cohomology<FilteredComplex,
persistent_cohomology::Field_Zp>::compute_persistent_cohomology(min_persistence);
// Custom sort and output persistence
cmp_intervals_by_dim_then_length cmp(stptr_);
auto persistent_pairs = persistent_cohomology::Persistent_cohomology<FilteredComplex,
persistent_cohomology::Field_Zp>::get_persistent_pairs();
std::sort(std::begin(persistent_pairs), std::end(persistent_pairs), cmp);
std::vector<std::pair<int, std::pair<double, double>>> persistence;
for (auto pair : persistent_pairs) {
persistence.push_back(std::make_pair(stptr_->dimension(get<0>(pair)),
std::make_pair(stptr_->filtration(get<0>(pair)),
stptr_->filtration(get<1>(pair)))));
}
return persistence;
}
private:
// A copy
FilteredComplex* stptr_;
};
} // namespace Gudhi
#endif // INCLUDE_PERSISTENT_COHOMOLOGY_INTERFACE_H_
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