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64 lines
1.9 KiB
C++
64 lines
1.9 KiB
C++
// This file is part of libigl, a simple c++ geometry processing library.
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//
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// Copyright (C) 2016 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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#include "sum.h"
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#include "redux.h"
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template <typename T>
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IGL_INLINE void igl::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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{
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assert((dim == 1 || dim == 2) && "dim must be 2 or 1");
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// Get size of input
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int m = X.rows();
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int n = X.cols();
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// resize output
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if(dim==1)
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{
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S = Eigen::SparseVector<T>(n);
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}else
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{
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S = Eigen::SparseVector<T>(m);
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}
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// Iterate over outside
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for(int k=0; k<X.outerSize(); ++k)
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{
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// Iterate over inside
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for(typename Eigen::SparseMatrix<T>::InnerIterator it (X,k); it; ++it)
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{
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if(dim == 1)
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{
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S.coeffRef(it.col()) += it.value();
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}else
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{
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S.coeffRef(it.row()) += it.value();
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}
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}
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}
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}
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template <typename AType, typename DerivedB>
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IGL_INLINE void igl::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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typedef typename DerivedB::Scalar Scalar;
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igl::redux(A,dim,[](Scalar a, Scalar b){ return a+b;},B);
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}
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#ifdef IGL_STATIC_LIBRARY
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// Explicit template instantiation
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// generated by autoexplicit.sh
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template void igl::sum<double, Eigen::Matrix<double, -1, 1, 0, -1, 1> >(Eigen::SparseMatrix<double, 0, int> const&, int, Eigen::PlainObjectBase<Eigen::Matrix<double, -1, 1, 0, -1, 1> >&);
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// generated by autoexplicit.sh
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template void igl::sum<bool, Eigen::Matrix<int, -1, 1, 0, -1, 1> >(Eigen::SparseMatrix<bool, 0, int> const&, int, Eigen::PlainObjectBase<Eigen::Matrix<int, -1, 1, 0, -1, 1> >&);
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template void igl::sum<double>(Eigen::SparseMatrix<double, 0, int> const&, int, Eigen::SparseVector<double, 0, int>&);
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#endif
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