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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/slice_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_SLICE_CACHED_H
#define IGL_SLICE_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
{
// Act like the matlab X(row_indices,col_indices) operator, where row_indices,
// col_indices are non-negative integer indices. This is a fast version of
// igl::slice that can analyze and store the sparsity structure. It is slower
// at the irst evaluation (slice_cached_precompute), but faster on the
// subsequent ones.
//
// Inputs:
// X m by n matrix
// R list of row indices
// C list of column indices
//
// Output:
// Y #R by #C matrix
// data Temporary data used by slice_cached to repeat this operation
//
// Usage:
//
// // Construct and slice up Laplacian
// SparseMatrix<double> L,L_sliced;
// igl::cotmatrix(V,F,L);
// // Normal igl::slice call
// igl::slice(L,in,in,L_in_in);
// // Fast version
// static VectorXi data; // static or saved in a global state
// if (data.size() == 0)
// igl::slice_cached_precompute(L,in,in,data,L_sliced);
// else
// igl::slice_cached(L,data,L_sliced);
template <typename TX, typename TY, typename DerivedI>
IGL_INLINE void slice_cached_precompute(
const Eigen::SparseMatrix<TX>& X,
const Eigen::Matrix<int,Eigen::Dynamic,1> & R,
const Eigen::Matrix<int,Eigen::Dynamic,1> & C,
Eigen::MatrixBase<DerivedI>& data,
Eigen::SparseMatrix<TY>& Y
);
template <typename TX, typename TY, typename DerivedI>
IGL_INLINE void slice_cached(
const Eigen::SparseMatrix<TX>& X,
const Eigen::MatrixBase<DerivedI>& data,
Eigen::SparseMatrix<TY>& Y
);
}
#ifndef IGL_STATIC_LIBRARY
# include "slice_cached.cpp"
#endif
#endif