/
count.h
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/
count.h
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// This file is part of libigl, a simple c++ geometry processing library.
//
// Copyright (C) 2013 Alec Jacobson <alecjacobson@gmail.com>
//
// 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/.
#ifndef IGL_COUNT_H
#define IGL_COUNT_H
#include "igl_inline.h"
#include <Eigen/Sparse>
namespace igl
{
/// Count the number of non-zeros in the columns or rows of a sparse matrix
///
/// @param[in] X m by n sparse matrix
/// @param[in] dim dimension along which to sum (1 or 2)
/// @param[out] S n-long _sparse_ vector (if dim == 1) or m-long sparse vector
/// (if dim == 2)
///
/// \note If your looking for dense matrix matlab like sum for eigen matrics
/// just use:
/// M.colwise().count() or M.rowwise().count()
///
template <typename XType, typename SType>
IGL_INLINE void count(
const Eigen::SparseMatrix<XType>& X,
const int dim,
Eigen::SparseVector<SType>& S);
/// \overload
///
/// \brief Outputs a dense vector.
template <typename XType, typename DerivedS>
IGL_INLINE void count(
const Eigen::SparseMatrix<XType>& X,
const int dim,
Eigen::PlainObjectBase<DerivedS>& S);
}
#ifndef IGL_STATIC_LIBRARY
# include "count.cpp"
#endif
#endif