diagTensor() template argument deduction/substitution failed about itensor HOT 2 CLOSED

Hi Xiongjie,
Good idea to convert this to a bug report instead of a discussion board question, as this is the more appropriate place for it.

The method diagTensor I was calling in the buggy code actually doesn't exist anymore! So that's why you were seeing the compilation error. I replaced it with the function delta which makes a diagonal tensor with all entries 1.0 on the diagonal. A delta tensor can be used to do the "tie index" operation.

But at the moment, we aren't even calling the LocalOp::diag method in the Davidson algorithm within DMRG. The reason is kind of complicated, but there was a subtle issue with how we were doing the Davidson preconditioner step in the previous version of ITensor - it was working but doing something slightly incorrect. The fix for it needs more testing to make sure it doesn't slow down the DMRG code too much, but once it's tested LocalOp::diag will again be called from the DMRG code.

Best,
Miles

from itensor.

Hi Miles,
Got it. Thanks for the quick reply!

Best regards,
Xiongjie

from itensor.