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Allow for negative strides.

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Note that using a stride of -1 is still not possible because it would
clash with the definition of Eigen::Dynamic.

This fixes #747.
This commit is contained in:
Gael Guennebaud
2021-01-27 23:29:33 +01:00
committed by David Tellenbach
parent 288d456c29
commit 0668c68b03
3 changed files with 50 additions and 3 deletions
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16
test/product_extra.cpp
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@@ -93,6 +93,22 @@ template<typename MatrixType> void product_extra(const MatrixType& m)
VERIFY_IS_APPROX(m1.col(j2).adjoint() * m1.block(0,j,m1.rows(),c), m1.col(j2).adjoint().eval() * m1.block(0,j,m1.rows(),c).eval());
VERIFY_IS_APPROX(m1.block(i,0,r,m1.cols()) * m1.row(i2).adjoint(), m1.block(i,0,r,m1.cols()).eval() * m1.row(i2).adjoint().eval());
// test negative strides
{
Map<MatrixType,Unaligned,Stride<Dynamic,Dynamic> > map1(&m1(rows-1,cols-1), rows, cols, Stride<Dynamic,Dynamic>(-m1.outerStride(),-1));
Map<MatrixType,Unaligned,Stride<Dynamic,Dynamic> > map2(&m2(rows-1,cols-1), rows, cols, Stride<Dynamic,Dynamic>(-m2.outerStride(),-1));
Map<RowVectorType,Unaligned,InnerStride<-1> > mapv1(&v1(v1.size()-1), v1.size(), InnerStride<-1>(-1));
Map<ColVectorType,Unaligned,InnerStride<-1> > mapvc2(&vc2(vc2.size()-1), vc2.size(), InnerStride<-1>(-1));
VERIFY_IS_APPROX(MatrixType(map1), m1.reverse());
VERIFY_IS_APPROX(MatrixType(map2), m2.reverse());
VERIFY_IS_APPROX(m3.noalias() = MatrixType(map1) * MatrixType(map2).adjoint(), m1.reverse() * m2.reverse().adjoint());
VERIFY_IS_APPROX(m3.noalias() = map1 * map2.adjoint(), m1.reverse() * m2.reverse().adjoint());
VERIFY_IS_APPROX(map1 * vc2, m1.reverse() * vc2);
VERIFY_IS_APPROX(m1 * mapvc2, m1 * mapvc2);
VERIFY_IS_APPROX(map1.adjoint() * v1.transpose(), m1.adjoint().reverse() * v1.transpose());
VERIFY_IS_APPROX(m1.adjoint() * mapv1.transpose(), m1.adjoint() * v1.reverse().transpose());
}
// regression test
MatrixType tmp = m1 * m1.adjoint() * s1;