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41 lines
1.2 KiB
41 lines
1.2 KiB
1 year ago
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// This file is part of libigl, a simple c++ geometry processing library.
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//
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// Copyright (C) 2019 Jérémie Dumas <jeremie.dumas@ens-lyon.org>
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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_SLICE_SORTED_H
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#define IGL_SLICE_SORTED_H
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#include "igl_inline.h"
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#include <Eigen/Dense>
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#include <Eigen/Sparse>
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namespace igl
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{
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/// Act like the matlab X(row_indices,col_indices) operator, where row_indices,
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/// col_indices are non-negative integer indices. This version is about 2x faster
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/// than igl::slice, but it assumes that the indices to slice with are already sorted.
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///
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/// @param[in] X m by n matrix
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/// @param[in] R list of row indices
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/// @param[in] C list of column indices
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/// @param[out] Y #R by #C matrix
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///
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/// \see slice
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template <typename TX, typename TY, typename DerivedR, typename DerivedC>
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IGL_INLINE void slice_sorted(
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const Eigen::SparseMatrix<TX> &X,
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const Eigen::DenseBase<DerivedR> &R,
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const Eigen::DenseBase<DerivedC> &C,
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Eigen::SparseMatrix<TY> &Y);
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}
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#ifndef IGL_STATIC_LIBRARY
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#include "slice_sorted.cpp"
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#endif
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#endif
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