devtools/eigen
1
0
Fork 0
mirror of https://gitlab.com/libeigen/eigen.git synced 2026-04-10 11:34:33 +08:00
Code Issues Packages Projects Releases Wiki Activity

Allow for negative strides.

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

28
test/mapstride.cpp
View File

@@ -162,6 +162,32 @@ template<int Alignment,typename MatrixType> void map_class_matrix(const MatrixTy
VERIFY_IS_APPROX(map,s1*m);
}
// test negative strides
{
Matrix<Scalar,Dynamic,1>::Map(a_array1, arraysize+1).setRandom();
Index outerstride = m.innerSize()+4;
Scalar* array = array1;
{
Map<MatrixType, Alignment, OuterStride<> > map1(array, rows, cols, OuterStride<>( outerstride));
Map<MatrixType, Unaligned, OuterStride<> > map2(array+(m.outerSize()-1)*outerstride, rows, cols, OuterStride<>(-outerstride));
if(MatrixType::IsRowMajor) VERIFY_IS_APPROX(map1.colwise().reverse(), map2);
else VERIFY_IS_APPROX(map1.rowwise().reverse(), map2);
}
{
Map<MatrixType, Alignment, OuterStride<> > map1(array, rows, cols, OuterStride<>( outerstride));
Map<MatrixType, Unaligned, Stride<Dynamic,Dynamic> > map2(array+(m.outerSize()-1)*outerstride+m.innerSize()-1, rows, cols, Stride<Dynamic,Dynamic>(-outerstride,-1));
VERIFY_IS_APPROX(map1.reverse(), map2);
}
{
Map<MatrixType, Alignment, OuterStride<> > map1(array, rows, cols, OuterStride<>( outerstride));
Map<MatrixType, Unaligned, Stride<Dynamic,-1> > map2(array+(m.outerSize()-1)*outerstride+m.innerSize()-1, rows, cols, Stride<Dynamic,-1>(-outerstride,-1));
VERIFY_IS_APPROX(map1.reverse(), map2);
}
}
internal::aligned_delete(a_array1, arraysize+1);
}
@@ -200,7 +226,7 @@ void bug1453()
EIGEN_DECLARE_TEST(mapstride)
{
for(int i = 0; i < g_repeat; i++) {
int maxn = 30;
int maxn = 3;
CALL_SUBTEST_1( map_class_vector<Aligned>(Matrix<float, 1, 1>()) );
CALL_SUBTEST_1( map_class_vector<Unaligned>(Matrix<float, 1, 1>()) );
CALL_SUBTEST_2( map_class_vector<Aligned>(Vector4d()) );