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48 lines
1.3 KiB
48 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_COUNT_H
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#define IGL_COUNT_H
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#include "igl_inline.h"
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#include <Eigen/Sparse>
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namespace igl
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{
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/// Count the number of non-zeros in the columns or rows of a sparse matrix
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///
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/// @param[in] X m by n sparse matrix
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/// @param[in] dim dimension along which to sum (1 or 2)
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/// @param[out] S n-long _sparse_ vector (if dim == 1) or m-long sparse vector
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/// (if dim == 2)
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///
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/// \note If your looking for dense matrix matlab like sum for eigen matrics
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/// just use:
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/// M.colwise().count() or M.rowwise().count()
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///
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template <typename XType, typename SType>
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IGL_INLINE void count(
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const Eigen::SparseMatrix<XType>& X,
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const int dim,
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Eigen::SparseVector<SType>& S);
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/// \overload
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///
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/// \brief Outputs a dense vector.
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template <typename XType, typename DerivedS>
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IGL_INLINE void count(
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const Eigen::SparseMatrix<XType>& X,
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const int dim,
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Eigen::PlainObjectBase<DerivedS>& S);
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}
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#ifndef IGL_STATIC_LIBRARY
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# include "count.cpp"
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#endif
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#endif
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