libigl_Martin/include/igl/null.h

// This file is part of libigl, a simple c++ geometry processing library.
// 
// Copyright (C) 2015 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_NULL_H
#define IGL_NULL_H
#include "igl_inline.h"

#include <Eigen/Dense>

namespace igl 
{
  // Like MATLAB's null
  //
  // 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.
  //
  // Inputs:
  //   A  m by n matrix
  // Outputs:
  //   N  n by r matrix, where r is the row rank of A
  template <typename DerivedA, typename DerivedN>
  IGL_INLINE void null(
    const Eigen::PlainObjectBase<DerivedA> & A,
    Eigen::PlainObjectBase<DerivedN> & N);
}

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

#endif