libigl_Martin/include/igl/isdiag.h

// This file is part of libigl, a simple c++ geometry processing library.
// 
// Copyright (C) 2016 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_ISDIAG_H
#define IGL_ISDIAG_H
#include "igl_inline.h"
#include <Eigen/Sparse>
namespace igl
{
  // Determine if a given matrix is diagonal: all non-zeros lie on the
  // main diagonal.
  //
  // Inputs:
  //   A  m by n sparse matrix
  // Returns true iff and only if the matrix is diagonal.
  template <typename Scalar>
  IGL_INLINE bool isdiag(const Eigen::SparseMatrix<Scalar> & A);
};
#ifndef IGL_STATIC_LIBRARY
#  include "isdiag.cpp"
#endif
#endif