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bug #881: make SparseMatrixBase::isApprox(SparseMatrixBase) exploits sparse computations instead of converting the operands to dense matrices.

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This commit is contained in:
Gael Guennebaud
2014-09-22 23:33:28 +02:00
parent ae514ddfe5
commit ff46ec0f24
3 changed files with 22 additions and 15 deletions
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30
Eigen/src/SparseCore/SparseFuzzy.h
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@@ -1,7 +1,7 @@
// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2008 Gael Guennebaud <gael.guennebaud@inria.fr>
// Copyright (C) 2008-2014 Gael Guennebaud <gael.guennebaud@inria.fr>
//
// 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
@@ -10,17 +10,21 @@
#ifndef EIGEN_SPARSE_FUZZY_H
#define EIGEN_SPARSE_FUZZY_H
// template<typename Derived>
// template<typename OtherDerived>
// bool SparseMatrixBase<Derived>::isApprox(
// const OtherDerived& other,
// typename NumTraits<Scalar>::Real prec
// ) const
// {
// const typename internal::nested<Derived,2>::type nested(derived());
// const typename internal::nested<OtherDerived,2>::type otherNested(other.derived());
// return (nested - otherNested).cwise().abs2().sum()
// <= prec * prec * (std::min)(nested.cwise().abs2().sum(), otherNested.cwise().abs2().sum());
// }
namespace Eigen {
template<typename Derived>
template<typename OtherDerived>
bool SparseMatrixBase<Derived>::isApprox(const SparseMatrixBase<OtherDerived>& other, const RealScalar &prec) const
{
using std::min;
const typename internal::nested_eval<Derived,2,PlainObject>::type actualA(derived());
typename internal::conditional<IsRowMajor==OtherDerived::IsRowMajor,
const typename internal::nested_eval<OtherDerived,2,PlainObject>::type,
const PlainObject>::type actualB(other.derived());
return (actualA - actualB).squaredNorm() <= prec * prec * (min)(actualA.squaredNorm(), actualB.squaredNorm());
}
} // end namespace Eigen
#endif // EIGEN_SPARSE_FUZZY_H