Function sparse_vector

test/sparse_vector.cpp:12–146

#include "sparse.h"

template<typename Scalar,typename StorageIndex> void sparse_vector(int rows, int cols)
{
  double densityMat = (std::max)(8./(rows*cols), 0.01);
  double densityVec = (std::max)(8./(rows), 0.1);
  typedef Matrix<Scalar,Dynamic,Dynamic> DenseMatrix;
  typedef Matrix<Scalar,Dynamic,1> DenseVector;
  typedef SparseVector<Scalar,0,StorageIndex> SparseVectorType;
  typedef SparseMatrix<Scalar,0,StorageIndex> SparseMatrixType;
  Scalar eps = 1e-6;

  SparseMatrixType m1(rows,rows);
  SparseVectorType v1(rows), v2(rows), v3(rows);
  DenseMatrix refM1 = DenseMatrix::Zero(rows, rows);
  DenseVector refV1 = DenseVector::Random(rows),
              refV2 = DenseVector::Random(rows),
              refV3 = DenseVector::Random(rows);

  std::vector<int> zerocoords, nonzerocoords;
  initSparse<Scalar>(densityVec, refV1, v1, &zerocoords, &nonzerocoords);
  initSparse<Scalar>(densityMat, refM1, m1);

  initSparse<Scalar>(densityVec, refV2, v2);
  initSparse<Scalar>(densityVec, refV3, v3);

  Scalar s1 = internal::random<Scalar>();

  // test coeff and coeffRef
  for (unsigned int i=0; i<zerocoords.size(); ++i)
  {
    VERIFY_IS_MUCH_SMALLER_THAN( v1.coeff(zerocoords[i]), eps );
    //VERIFY_RAISES_ASSERT( v1.coeffRef(zerocoords[i]) = 5 );
  }
  {
    VERIFY(int(nonzerocoords.size()) == v1.nonZeros());
    int j=0;
    for (typename SparseVectorType::InnerIterator it(v1); it; ++it,++j)
    {
      VERIFY(nonzerocoords[j]==it.index());
      VERIFY(it.value()==v1.coeff(it.index()));
      VERIFY(it.value()==refV1.coeff(it.index()));
    }
  }
  VERIFY_IS_APPROX(v1, refV1);
  
  // test coeffRef with reallocation
  {
    SparseVectorType v4(rows);
    DenseVector v5 = DenseVector::Zero(rows);
    for(int k=0; k<rows; ++k)
    {
      int i = internal::random<int>(0,rows-1);
      Scalar v = internal::random<Scalar>();
      v4.coeffRef(i) += v;
      v5.coeffRef(i) += v;
    }
    VERIFY_IS_APPROX(v4,v5);
  }