Dear All

I'm making my first experiments with Alps...
I want to use DMRG for ferrimagnetic chain,but i have some problems.

First,in the dmrg steps because the chain don't have the symmetry between left and right halves,the density matrices for these two halves should be constructed at every iteration of the calculation.

Second,I think that it isn't exist spin parity symmetry.

How i can do these?

Thanks in advance

zhian