libigl/include/igl/null.h

// This file is part of libigl, a simple c++ geometry processing library.
// 
// Copyright (C) 2015 Alec Jacobson <[email protected]>
// 
// 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_NULL_H
#define IGL_NULL_H
#include "igl_inline.h"

#include <Eigen/Dense>

namespace igl 
{
  /// Compute a basis for the null space for the given matrix A: the columns of
  /// the output N form a basis for the space orthogonal to that spanned by the
  /// rows of A.
  /// Like MATLAB's null
  ///
  /// @param[in] A  m by n matrix
  /// @param[out] N  n by r matrix, where r is the row rank of A
  template <typename DerivedA, typename DerivedN>
  IGL_INLINE void null(
    const Eigen::MatrixBase<DerivedA> & A,
    Eigen::PlainObjectBase<DerivedN> & N);
}

#ifndef IGL_STATIC_LIBRARY
#  include "null.cpp"
#endif

#endif