Feature/hackathon2022 shift transpose

[keshvituteja]

Tests for shift and transpose for LinAlg and Tensor. Haven't remove the previous tests, just added more tests in the same cpp files. The test for transpose matmul ( (AB)^T = B^T A^T) may or may not pass, since the precision is very low .

[Marcel-Rodekamp]

The first test shiftTensor in the way how it is written tests basically nothing as the first element of A will not be the first element of Ashift (due to the shift). Therefore, the addresses are never the same. It would be best to add a facility isViewOf to the Tensor class to simplify this kind of checks. The second test shiftTensorBySize should test not only the zeroth dimension but all dimensions. This test needs alot rework and expansion (see list below). We reject it here so that a reworked version can be merged into devel later.

Things to add:

• Add check that Ashift is not (for NSL::LinAlg) a view of A.
• Add different dimensions to shiftTensorBySize
• Add -size_arr to shiftTensorBySize (should also be an identity operation)
• Add check that different shifts do the correct thing (explicitly shift a array and compare to what we expect for a given shift)
• Add check of the shift with boundary
• Add a check with a shift that is larger then the size of the dimension (I expect a modulo to happen)