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Random_bitmap_cubical_complex.cpp

# Coxeter_triangulation

/* This file is part of the Gudhi Library - https://gudhi.inria.fr/ - which is released under MIT.
* See file LICENSE or go to https://gudhi.inria.fr/licensing/ for full license details.
* Author(s): Pawel Dlotko
*
* Copyright (C) 2015 Inria
*
* Modification(s):
* - YYYY/MM Author: Description of the modification
*/
// for persistence algorithm
#include <gudhi/reader_utils.h>
#include <gudhi/Bitmap_cubical_complex.h>
#include <gudhi/Persistent_cohomology.h>
// standard stuff
#include <iostream>
#include <sstream>
#include <vector>
#include <random>
#include <algorithm>
std::random_device rd;
std::mt19937 gen(rd());
double get_random()
{
std::uniform_real_distribution<double> dist(0., 1.);
return dist(gen);
}
int main(int argc, char** argv) {
std::clog
<< "This program computes persistent homology, by using bitmap_cubical_complex class, of cubical "
<< "complexes. The first parameter of the program is the dimension D of the bitmap. The next D parameters are "
<< "number of top dimensional cubes in each dimension of the bitmap. The program will create random cubical "
<< "complex of that sizes and compute persistent homology of it." << std::endl;
int p = 2;
double min_persistence = 0;
if (argc < 3) {
std::cerr << "Wrong number of parameters, the program will now terminate\n";
return 1;
}
size_t dimensionOfBitmap = (size_t)atoi(argv[1]);
std::vector<unsigned> sizes;
size_t multipliers = 1;
for (size_t dim = 0; dim != dimensionOfBitmap; ++dim) {
unsigned sizeInThisDimension = (unsigned)atoi(argv[2 + dim]);
sizes.push_back(sizeInThisDimension);
multipliers *= sizeInThisDimension;
}
std::vector<double> data(multipliers);
std::generate(data.begin(), data.end(), get_random);
typedef Gudhi::cubical_complex::Bitmap_cubical_complex_base<double> Bitmap_cubical_complex_base;
typedef Gudhi::cubical_complex::Bitmap_cubical_complex<Bitmap_cubical_complex_base> Bitmap_cubical_complex;
Bitmap_cubical_complex b(sizes, data);
// Compute the persistence diagram of the complex
typedef Gudhi::persistent_cohomology::Field_Zp Field_Zp;
typedef Gudhi::persistent_cohomology::Persistent_cohomology<Bitmap_cubical_complex, Field_Zp> Persistent_cohomology;
Persistent_cohomology pcoh(b);
pcoh.init_coefficients(p); // initializes the coefficient field for homology
pcoh.compute_persistent_cohomology(min_persistence);
std::stringstream ss;
ss << "randomComplex_persistence";
std::ofstream out(ss.str().c_str());
pcoh.output_diagram(out);
out.close();
return 0;
}
Gudhi::cubical_complex::Bitmap_cubical_complex_base
Cubical complex represented as a bitmap, class with basic implementation.
Definition Bitmap_cubical_complex_base.h:57
Gudhi::cubical_complex::Bitmap_cubical_complex
Cubical complex represented as a bitmap.
Definition Bitmap_cubical_complex.h:49
Gudhi::persistent_cohomology::Field_Zp
Structure representing the coefficient field .
Definition Field_Zp.h:27
Gudhi::persistent_cohomology::Persistent_cohomology
Computes the persistent cohomology of a filtered complex.
Definition Persistent_cohomology.h:54
reader_utils.h
This file includes common file reader for GUDHI.