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37 lines
1.2 KiB
37 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) 2014 Daniele Panozzo <daniele.panozzo@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_DOT_ROW_H
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#define IGL_DOT_ROW_H
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#include "igl/igl_inline.h"
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#include <Eigen/Core>
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namespace igl
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{
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/// Compute the dot product between each row of A and B
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///
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/// @tparam DerivedV derived from vertex positions matrix type: i.e. MatrixXd
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/// @param[in] A eigen matrix r by c
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/// @param[in] B eigen matrix r by c
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/// @param[out] d a column vector with r entries that contains the dot product of each corresponding row of A and B
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///
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/// \note Unfortunately, Eigen does not support `A.rowwise().dot(B.rowwise())`
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/// so this function is a wrapper around the less obvious and less convenient
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/// `(A.array() * B.array()).rowwise().sum()`.
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template <typename DerivedV>
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IGL_INLINE DerivedV dot_row(
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const Eigen::PlainObjectBase<DerivedV>& A,
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const Eigen::PlainObjectBase<DerivedV>& B);
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}
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#ifndef IGL_STATIC_LIBRARY
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# include "dot_row.cpp"
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#endif
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#endif
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