Can I reverse only certain arrow directions of an IQTensor?

Question

Hello!

Is it possible to reverse only certain arrows of an IQTensor without subclassing or similar tricks?

I can't do something like
conj(dag(iqtensor));

because this reverses all arrow directions.

I made a sketch of the relevant case:
http://imgur.com/7tpfj1g

Best regards and thank you.

Answer 1

Hi, I see what you are asking and the sketch that you linked, but could you give me a little more background on why you want to do it? After thinking about it a bit, flipping the arrows is associate with complex conjugation, yet there's no way to "partially" conjugate elements of a tensor.

On the other hand, individual IQIndex arrows could in principle be reversed if the data in the IQTensor was moved into a different pattern of quantum number blocks. But this might be involved to implement so I'd like to better understand the use case.

Best,
Miles

Comments

Hi!

I've just discovered that I understood the arrows wrong and that I don't need this kind of operation.
I'm currently working on an implementation for TDVP (http://arxiv.org/abs/1408.5056) in ITensor.
I thought that I need the "Arrow inversion" for the application of the effective Hamiltonian on a Tensor.

Nevertheless, thank you very much for your answer!

Best regards,
Florian

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Hi Florian,
Ok glad you figured it out!