Special vector

[rborrelli]

Hi, this might not be strictly related to the library, but is it possible to compute a TT representation of a 2d-dimensional vector of this type:

$\sum_{n_1,n_2,...m_1 m_2} | n_1 n_2 ... n_d m_1 m_2 ...m_d> \delta_{n_1 m_1}\delta_{n_2 m_2}...\delta_{n_d m_d} = \sum_{n_1,n_2...} | n_1 n_2 ... n_d n_1 n_2 ...n_d>$

without reshuffling the positions of the indices n_1, m_1? (Changing the order of the indices it is very easy but in TT representations the order of the indices matters) This type of vector can be important when computing traces of multidimensional operators written in vector form.

Raffaele