49 lines
1.5 KiB
C
49 lines
1.5 KiB
C
|
// This file is part of libigl, a simple c++ geometry processing library.
|
||
|
|
//
|
||
|
|
// Copyright (C) 2013 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/.
|
||
|
|
#ifndef IGL_HARWELL_BOEING_H
|
||
|
|
#define IGL_HARWELL_BOEING_H
|
||
|
|
#include "igl_inline.h"
|
||
|
|
|
||
|
|
#include <Eigen/Sparse>
|
||
|
|
#include <vector>
|
||
|
|
|
||
|
|
|
||
|
|
namespace igl
|
||
|
|
{
|
||
|
|
// Convert the matrix to Compressed sparse column (CSC or CCS) format,
|
||
|
|
// also known as Harwell Boeing format. As described:
|
||
|
|
// http://netlib.org/linalg/html_templates/node92.html
|
||
|
|
// or
|
||
|
|
// http://en.wikipedia.org/wiki/Sparse_matrix
|
||
|
|
// #Compressed_sparse_column_.28CSC_or_CCS.29
|
||
|
|
// Templates:
|
||
|
|
// Scalar type of sparse matrix like double
|
||
|
|
// Inputs:
|
||
|
|
// A sparse m by n matrix
|
||
|
|
// Outputs:
|
||
|
|
// num_rows number of rows
|
||
|
|
// V non-zero values, row indices running fastest, size(V) = nnz
|
||
|
|
// R row indices corresponding to vals, size(R) = nnz
|
||
|
|
// C index in vals of first entry in each column, size(C) = num_cols+1
|
||
|
|
//
|
||
|
|
// All indices and pointers are 0-based
|
||
|
|
template <typename Scalar, typename Index>
|
||
|
|
IGL_INLINE void harwell_boeing(
|
||
|
|
const Eigen::SparseMatrix<Scalar> & A,
|
||
|
|
int & num_rows,
|
||
|
|
std::vector<Scalar> & V,
|
||
|
|
std::vector<Index> & R,
|
||
|
|
std::vector<Index> & C);
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifndef IGL_STATIC_LIBRARY
|
||
|
|
# include "harwell_boeing.cpp"
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif
|