TeNPy Forum

Any answer to this?

Hello again, Disclaimer: I am far from a computer scientist and probably mix and use wrong terminology :D Also, I am not talking about going deep into the implementation like here https://tenpy.johannes-hauschild.de/viewtopic.php?t=4 I have to calculate many independent ground states for different p...

Hello again, I sometimes want to look at the actual data of the tensors in an MPS or MPO network, but I am a bit puzzled by the ._data attribute. For example, I want the W tensor of a Bose Hubbard model w/o conservation. I create the model model_params = dict( filling = 1., n_max = 4, t = 1, U = 1, ...

I did not specifically install this compiler, no. I asked our admin to check if gcc is up to date (which it was) but he also updated a bunch of other things and now it is working. I dont know what exactly was the problem (so for future references this thread might be not very helpful) but at least i...

Hello Johannes, thanks again for the answer! On my personal computer on Ubuntu 18 it works fine, the problem here is on a Ubuntu 16 server. When I try to compile your minimal example I get a similar error: (tenpy) kkottmann@pcl1016:~$ cythonize -bi a.pyx Compiling /home/kkottmann/a.pyx because it ch...

Hello, does somebody have an idea what might be the problem here? I tried to compile the cython files but get this error message. I updated cython but the problem remains: :~/TeNPy$ bash ./compile.sh Compiling tenpy/linalg/_npc_helper.pyx because it changed. [1/1] Cythonizing tenpy/linalg/_npc_helpe...

Thanks for your quick response! For finite `L`, there is a finite size gap such that the true ground state is a superposition of the positive and negative X. Okay, so far so good. But I think I miss the point why I would then compute e.g. M^2 = <\left(\sum_i s_x^i\right)^2> . Or to phrase it differe...

Hello, I am trying to reproduce the phase diagram of the transverse field Ising Model on a 1d chain. I essentially use the example code in d_examples_dmrg. from tenpy.networks.mps import MPS from tenpy.models.tf_ising import TFIChain from tenpy.algorithms import dmrg def DMRG_finite(L, g,verbose=Fal...