You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
64 lines
1.9 KiB
64 lines
1.9 KiB
// This file is part of libigl, a simple c++ geometry processing library.
|
|
//
|
|
// Copyright (C) 2016 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/.
|
|
#include "sum.h"
|
|
#include "redux.h"
|
|
|
|
template <typename T>
|
|
IGL_INLINE void igl::sum(
|
|
const Eigen::SparseMatrix<T>& X,
|
|
const int dim,
|
|
Eigen::SparseVector<T>& S)
|
|
{
|
|
assert((dim == 1 || dim == 2) && "dim must be 2 or 1");
|
|
// Get size of input
|
|
int m = X.rows();
|
|
int n = X.cols();
|
|
// resize output
|
|
if(dim==1)
|
|
{
|
|
S = Eigen::SparseVector<T>(n);
|
|
}else
|
|
{
|
|
S = Eigen::SparseVector<T>(m);
|
|
}
|
|
|
|
// Iterate over outside
|
|
for(int k=0; k<X.outerSize(); ++k)
|
|
{
|
|
// Iterate over inside
|
|
for(typename Eigen::SparseMatrix<T>::InnerIterator it (X,k); it; ++it)
|
|
{
|
|
if(dim == 1)
|
|
{
|
|
S.coeffRef(it.col()) += it.value();
|
|
}else
|
|
{
|
|
S.coeffRef(it.row()) += it.value();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
template <typename AType, typename DerivedB>
|
|
IGL_INLINE void igl::sum(
|
|
const Eigen::SparseMatrix<AType> & A,
|
|
const int dim,
|
|
Eigen::PlainObjectBase<DerivedB>& B)
|
|
{
|
|
typedef typename DerivedB::Scalar Scalar;
|
|
igl::redux(A,dim,[](Scalar a, Scalar b){ return a+b;},B);
|
|
}
|
|
|
|
#ifdef IGL_STATIC_LIBRARY
|
|
// Explicit template instantiation
|
|
// generated by autoexplicit.sh
|
|
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> >&);
|
|
// generated by autoexplicit.sh
|
|
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> >&);
|
|
template void igl::sum<double>(Eigen::SparseMatrix<double, 0, int> const&, int, Eigen::SparseVector<double, 0, int>&);
|
|
#endif
|
|
|