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43 lines
1.2 KiB
43 lines
1.2 KiB
// This file is part of libigl, a simple c++ geometry processing library.
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//
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// Copyright (C) 2015 Olga Diamanti, Alec Jacobson
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//
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// This Source Code Form is subject to the terms of the Mozilla Public License
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// v. 2.0. If a copy of the MPL was not distributed with this file, You can
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// obtain one at http://mozilla.org/MPL/2.0/.
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#ifndef IGL_NCHOOSEK
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#define IGL_NCHOOSEK
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#include "igl_inline.h"
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#include <vector>
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#include <Eigen/Core>
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namespace igl
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{
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/// Binomial coefficient. Like matlab's nchoosek.
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///
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/// @param[in] n total number elements
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/// @param[in] k size of sub-set to consider
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/// @return number of k-size combinations out of the set [1,...,n]
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IGL_INLINE double nchoosek(const int n, const int k);
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/// All combinations . Like matlab's nchoosek.
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///
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/// @param[in] V n-long vector of elements
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/// @param[in] k size of sub-set to consider
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/// @param[out] U nchoosek by k long matrix where each row is a unique k-size
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/// combination
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template < typename DerivedV, typename DerivedU>
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IGL_INLINE void nchoosek(
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const Eigen::MatrixBase<DerivedV> & V,
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const int k,
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Eigen::PlainObjectBase<DerivedU> & U);
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}
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#ifndef IGL_STATIC_LIBRARY
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#include "nchoosek.cpp"
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#endif
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#endif /* defined(IGL_NCHOOSEK) */
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