Mingru Yang

Added an Arnoldi method to build the Krylov subspace, a restarting procedure, and a time step adjusting scheme, though I didn't find a more graceful way to treat complex and...

.position() of MPS does not preserve the link index of the MPS

1

Hi Matt and Miles, The .position() function to move the orthogonality center does not preserve the link index of the MPS. This will cause some problems as explained below. I...

Wrong MPO when using removeQN for Electron SiteSet

2

I want to do a time evolution which still conserve the quantum numbers but also measure a quantity which violate the Sz conservation. To measure for an initial state with...

Fix the wrong definition of avnorm in applyExp

2

According to [page 17 of this paper](https://epubs.siam.org/doi/abs/10.1137/0729014), `avnorm` which is used for error estimate should be Av_{m+1} instead of Av_m.

PlusEq and other operations between QDenseReal and QDiagReal

1

Now if I use "delta(i, prime(i)) - T" where T is a dense ITensor(i, prime(i)), I will get "terminate called after throwing an instance of 'itensor::ITError' what(): doTask not defined...

This changes does not work for small blocks. 1E-3 seems to be too large, which makes docut larger than sqr(d(n)) in function svdImpl in svd.cc and results this_m=0. This makes...

Unable to do subspace expansion for QN conserved Hamiltonian with only next-nearest-neighbor hopping

11

As mentioned in #69, the default subspace expansion does not work in my case: ``` maxdim = 100 # Maximum bond dimension cutoff = 1e-8 # Singular value cutoff when...