48 lines
1.3 KiB
C++
48 lines
1.3 KiB
C++
// 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_SUM_H
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#define IGL_SUM_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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// 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().sum() or M.rowwise().sum()
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//
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// Sum the columns or rows of a sparse matrix
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// Templates:
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// T should be a eigen sparse matrix primitive type like int or double
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// Inputs:
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// X m by n sparse matrix
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// dim dimension along which to sum (1 or 2)
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// Output:
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// S n-long sparse vector (if dim == 1)
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// or
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// S m-long sparse vector (if dim == 2)
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template <typename T>
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IGL_INLINE void sum(
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const Eigen::SparseMatrix<T>& X,
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const int dim,
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Eigen::SparseVector<T>& S);
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// Sum is "conducted" in the type of DerivedB::Scalar
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template <typename AType, typename DerivedB>
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IGL_INLINE void sum(
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const Eigen::SparseMatrix<AType> & A,
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const int dim,
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Eigen::PlainObjectBase<DerivedB>& B);
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}
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#ifndef IGL_STATIC_LIBRARY
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# include "sum.cpp"
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#endif
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#endif
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