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Implement evaluator for Diagonal.

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This commit is contained in:
Jitse Niesen 2011-04-22 22:36:45 +01:00
parent f924722f3b
commit 3457965bf5
3 changed files with 73 additions and 1 deletions
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46
Eigen/src/Core/CoreEvaluators.h
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@ -881,6 +881,52 @@ protected:
};
// -------------------- Diagonal --------------------
template<typename ArgType, int DiagIndex>
struct evaluator_impl<Diagonal<ArgType, DiagIndex> >
{
typedef Diagonal<ArgType, DiagIndex> DiagonalType;
evaluator_impl(const DiagonalType& diagonal)
: m_argImpl(diagonal.nestedExpression()),
m_index(diagonal.index())
{ }
typedef typename DiagonalType::Index Index;
typedef typename DiagonalType::Scalar Scalar;
typedef typename DiagonalType::CoeffReturnType CoeffReturnType;
CoeffReturnType coeff(Index row, Index) const
{
return m_argImpl.coeff(row + rowOffset(), row + colOffset());
}
CoeffReturnType coeff(Index index) const
{
return m_argImpl.coeff(index + rowOffset(), index + colOffset());
}
Scalar& coeffRef(Index row, Index)
{
return m_argImpl.coeffRef(row + rowOffset(), row + colOffset());
}
Scalar& coeffRef(Index index)
{
return m_argImpl.coeffRef(index + rowOffset(), index + colOffset());
}
protected:
typename evaluator<ArgType>::type m_argImpl;
Index m_index; // TODO: Don't use if known at compile time
private:
EIGEN_STRONG_INLINE Index rowOffset() const { return m_index>0 ? 0 : -m_index; }
EIGEN_STRONG_INLINE Index colOffset() const { return m_index>0 ? m_index : 0; }
};
} // namespace internal
#endif // EIGEN_COREEVALUATORS_H

11
Eigen/src/Core/Diagonal.h
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@ -133,6 +133,17 @@ template<typename MatrixType, int DiagIndex> class Diagonal
return m_matrix.coeff(index+rowOffset(), index+colOffset());
}
const typename internal::remove_all<typename MatrixType::Nested>::type&
nestedExpression() const
{
return m_matrix;
}
int index() const
{
return m_index.value();
}
protected:
const typename MatrixType::Nested m_matrix;
const internal::variable_if_dynamic<Index, DiagIndex> m_index;

17
test/evaluators.cpp
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@ -197,7 +197,22 @@ void test_evaluators()
VERIFY_IS_APPROX_EVALUATOR(arr2, arr1.reverse());
VERIFY_IS_APPROX_EVALUATOR(arr2, arr1.colwise().reverse());
VERIFY_IS_APPROX_EVALUATOR(arr2, arr1.rowwise().reverse());
arr2.reverse() = arr1;
VERIFY_IS_APPROX(arr2, arr1.reverse());
// test Diagonal
VERIFY_IS_APPROX_EVALUATOR(vec1, mat1.diagonal());
vec1.resize(5);
VERIFY_IS_APPROX_EVALUATOR(vec1, mat1.diagonal(1));
VERIFY_IS_APPROX_EVALUATOR(vec1, mat1.diagonal<-1>());
vec1.setRandom();
mat2 = mat1;
copy_using_evaluator(mat1.diagonal(1), vec1);
mat2.diagonal(1) = vec1;
VERIFY_IS_APPROX(mat1, mat2);
copy_using_evaluator(mat1.diagonal<-1>(), mat1.diagonal(1));
mat2.diagonal<-1>() = mat2.diagonal(1);
VERIFY_IS_APPROX(mat1, mat2);
}