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Merged branch 'dev_native' into lm_sla_supports_auto

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Added igl library files
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Lukas Matena 2018-10-26 15:45:52 +02:00
commit 7681d00ee5
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src/igl/AtA_cached.h Normal file
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// This file is part of libigl, a simple c++ geometry processing library.
//
// Copyright (C) 2017 Daniele Panozzo <daniele.panozzo@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_ATA_CACHED_H
#define IGL_ATA_CACHED_H
#include "igl_inline.h"
#define EIGEN_YES_I_KNOW_SPARSE_MODULE_IS_NOT_STABLE_YET
#include <Eigen/Dense>
#include <Eigen/Sparse>
namespace igl
{
struct AtA_cached_data
{
// Weights
Eigen::VectorXd W;
// Flatten composition rules
std::vector<int> I_row;
std::vector<int> I_col;
std::vector<int> I_w;
// For each entry of AtA, points to the beginning
// of the composition rules
std::vector<int> I_outer;
};
// Computes At * W * A, where A is sparse and W is diagonal. Divides the
// construction in two phases, one
// for fixing the sparsity pattern, and one to populate it with values. Compared to
// evaluating it directly, this version is slower for the first time (since it requires a
// precomputation), but faster to the subsequent evaluations.
//
// Input:
// A m x n sparse matrix
// data stores the precomputed sparsity pattern, data.W contains the optional diagonal weights (stored as a dense vector). If W is not provided, it is replaced by the identity.
// Outputs:
// AtA m by m matrix computed as AtA * W * A
//
// Example:
// AtA_data = igl::AtA_cached_data();
// AtA_data.W = W;
// if (s.AtA.rows() == 0)
// igl::AtA_cached_precompute(s.A,s.AtA_data,s.AtA);
// else
// igl::AtA_cached(s.A,s.AtA_data,s.AtA);
template <typename Scalar>
IGL_INLINE void AtA_cached_precompute(
const Eigen::SparseMatrix<Scalar>& A,
AtA_cached_data& data,
Eigen::SparseMatrix<Scalar>& AtA
);
template <typename Scalar>
IGL_INLINE void AtA_cached(
const Eigen::SparseMatrix<Scalar>& A,
const AtA_cached_data& data,
Eigen::SparseMatrix<Scalar>& AtA
);
}
#ifndef IGL_STATIC_LIBRARY
# include "AtA_cached.cpp"
#endif
#endif