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persistence_intervals/plot_persistence_Betti_numbers.cpp
/* 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) 2016 Inria
*
* Modification(s):
* - YYYY/MM Author: Description of the modification
*/
#include <gudhi/Persistence_intervals.h>
#include <iostream>
#include <vector>
#include <limits>
#include <utility>
using Persistence_intervals = Gudhi::Persistence_representations::Persistence_intervals;
int main(int argc, char** argv) {
if ((argc != 3) && (argc != 2)) {
std::clog << "This program creates a gnuplot script of Betti numbers from a single persistence diagram file"
<< "(*.pers).\n"
<< "To run this program, please provide the name of a file with persistence diagram.\n"
<< "The second optional parameter of a program is the dimension of the persistence that is to be used. "
<< "If your file contains only birth-death pairs, you can skip this parameter.\n";
return 1;
}
unsigned dimension = std::numeric_limits<unsigned>::max();
int dim = -1;
if (argc == 3) {
dim = atoi(argv[2]);
}
if (dim >= 0) {
dimension = (unsigned)dim;
}
Persistence_intervals p(argv[1], dimension);
std::vector<std::pair<double, size_t> > pbns = p.compute_persistent_betti_numbers();
// set up the ranges so that we see the image well.
double xRangeBegin = pbns[0].first;
double xRangeEnd = pbns[pbns.size() - 1].first;
double yRangeBegin = 0;
double yRangeEnd = 0;
for (size_t i = 0; i != pbns.size(); ++i) {
if (pbns[i].second > yRangeEnd) yRangeEnd = pbns[i].second;
}
xRangeBegin -= (xRangeEnd - xRangeBegin) / 100.0;
xRangeEnd += (xRangeEnd - xRangeBegin) / 100.0;
yRangeEnd += yRangeEnd / 100;
std::stringstream gnuplot_script;
gnuplot_script << argv[1] << "_GnuplotScript";
std::ofstream out;
out.open(gnuplot_script.str().c_str());
out << "set xrange [" << xRangeBegin << " : " << xRangeEnd << "]" << std::endl;
out << "set yrange [" << yRangeBegin << " : " << yRangeEnd << "]" << std::endl;
out << "plot '-' using 1:2 notitle with lp " << std::endl;
double previous_y = 0;
for (size_t i = 0; i != pbns.size(); ++i) {
out << pbns[i].first << " " << previous_y << std::endl;
out << pbns[i].first << " " << pbns[i].second << std::endl;
previous_y = pbns[i].second;
}
out << std::endl;
out.close();
std::clog << "To visualize, install gnuplot and type the command: gnuplot -persist -e \"load \'"
<< gnuplot_script.str().c_str() << "\'\"" << std::endl;
return 0;
}
Gudhi::Persistence_representations::Persistence_intervals
Definition Persistence_intervals.h:37
Gudhi::Persistence_representations::Persistence_intervals::compute_persistent_betti_numbers
std::vector< std::pair< double, size_t > > compute_persistent_betti_numbers() const
Definition Persistence_intervals.h:429