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/* 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): Marc Glisse
*
* Copyright (C) 2020 Inria
*
* Modification(s):
* - YYYY/MM Author: Description of the modification
*/
#include <pybind11/pybind11.h>
#include <pybind11/numpy.h>
#include <boost/range/counting_range.hpp>
#include <boost/range/adaptor/transformed.hpp>
namespace py = pybind11;
typedef py::array_t<double> Dgm;
// Get m[i,0] and m[i,1] as a pair
static auto pairify(void* p, ssize_t h, ssize_t w) {
return [=](ssize_t i){
char* birth = (char*)p + i * h;
char* death = birth + w;
return std::make_pair(*(double*)birth, *(double*)death);
};
}
inline auto numpy_to_range_of_pairs(py::array_t<double> dgm) {
py::buffer_info buf = dgm.request();
// shape (n,2) or (0) for empty
if((buf.ndim!=2 || buf.shape[1]!=2) && (buf.ndim!=1 || buf.shape[0]!=0))
throw std::runtime_error("Diagram must be an array of size n x 2");
// In the case of shape (0), avoid reading non-existing strides[1] even if we won't use it.
ssize_t stride1 = buf.ndim == 2 ? buf.strides[1] : 0;
auto cnt = boost::counting_range<ssize_t>(0, buf.shape[0]);
return boost::adaptors::transform(cnt, pairify(buf.ptr, buf.strides[0], stride1));
// Be careful that the returned range cannot contain references to dead temporaries.
}
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