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41 lines
1.3 KiB
41 lines
1.3 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) 2013 Alec Jacobson <alecjacobson@gmail.com>
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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_GROUP_SUM_MATRIX_H
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#define IGL_GROUP_SUM_MATRIX_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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/// Builds a matrix A such that A*V computes the sum of
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/// vertices in each group specified by G
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///
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/// @tparam T should be a eigen sparse matrix primitive type like int or double
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/// @param[in] G #V list of group indices (0 to k-1) for each vertex, such that vertex i
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/// is assigned to group G(i)
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/// @param[in] k #groups, good choice is max(G)+1
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/// @param[out] A #groups by #V sparse matrix such that A*V = group_sums
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///
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template <typename T>
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IGL_INLINE void group_sum_matrix(
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const Eigen::Matrix<int,Eigen::Dynamic,1> & G,
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const int k,
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Eigen::SparseMatrix<T>& A);
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/// \overload
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template <typename T>
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IGL_INLINE void group_sum_matrix(
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const Eigen::Matrix<int,Eigen::Dynamic,1> & G,
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Eigen::SparseMatrix<T>& A);
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}
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#ifndef IGL_STATIC_LIBRARY
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# include "group_sum_matrix.cpp"
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#endif
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#endif
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