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Merged branch 'dev_native' into lm_sla_supports_auto

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Added igl library files
This commit is contained in:
Lukas Matena 2018-10-26 15:45:52 +02:00
commit 7681d00ee5
2865 changed files with 142806 additions and 22325 deletions
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src/igl/nchoosek.cpp Normal file
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// This file is part of libigl, a simple c++ geometry processing library.
//
// Copyright (C) 2015 Olga Diamanti, Alec Jacobson
//
// This Source Code Form is subject to the terms of the Mozilla Public License
// v. 2.0. If a copy of the MPL was not distributed with this file, You can
// obtain one at http://mozilla.org/MPL/2.0/.
#include "nchoosek.h"
#include <cmath>
#include <cassert>
IGL_INLINE double igl::nchoosek(const int n, const int k)
{
if(k>n/2)
{
return nchoosek(n,n-k);
}else if(k==1)
{
return n;
}else
{
double c = 1;
for(int i = 1;i<=k;i++)
{
c *= (((double)n-k+i)/((double)i));
}
return std::round(c);
}
}
template < typename DerivedV, typename DerivedU>
IGL_INLINE void igl::nchoosek(
const Eigen::MatrixBase<DerivedV> & V,
const int k,
Eigen::PlainObjectBase<DerivedU> & U)
{
using namespace Eigen;
if(V.size() == 0)
{
U.resize(0,k);
return;
}
assert((V.cols() == 1 || V.rows() == 1) && "V must be a vector");
U.resize(nchoosek(V.size(),k),k);
int running_i = 0;
int running_j = 0;
Matrix<typename DerivedU::Scalar,1,Dynamic> running(1,k);
int N = V.size();
const std::function<void(int,int)> doCombs =
[&running,&N,&doCombs,&running_i,&running_j,&U,&V](int offset, int k)
{
if(k==0)
{
U.row(running_i) = running;
running_i++;
return;
}
for (int i = offset; i <= N - k; ++i)
{
running(running_j) = V(i);
running_j++;
doCombs(i+1,k-1);
running_j--;
}
};
doCombs(0,k);
}
#ifdef IGL_STATIC_LIBRARY
// Explicit template instantiation
template void igl::nchoosek<Eigen::Matrix<int, -1, 1, 0, -1, 1>, Eigen::Matrix<int, -1, -1, 0, -1, -1> >(Eigen::MatrixBase<Eigen::Matrix<int, -1, 1, 0, -1, 1> > const&, int, Eigen::PlainObjectBase<Eigen::Matrix<int, -1, -1, 0, -1, -1> >&);
#if EIGEN_VERSION_AT_LEAST(3,3,0)
#else
template void igl::nchoosek<Eigen::CwiseNullaryOp<Eigen::internal::linspaced_op<int, true>, Eigen::Matrix<int, -1, 1, 0, -1, 1> >, Eigen::Matrix<int, -1, -1, 0, -1, -1> >(Eigen::MatrixBase<Eigen::CwiseNullaryOp<Eigen::internal::linspaced_op<int, true>, Eigen::Matrix<int, -1, 1, 0, -1, 1> > > const&, int, Eigen::PlainObjectBase<Eigen::Matrix<int, -1, -1, 0, -1, -1> >&);
#endif
#endif