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Updgrade guide #9

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May 12, 2024
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Updgrade guide #9

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Updgrade guide
mtfishman May 11, 2024
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Update README.md
mtfishman May 12, 2024
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mtfishman May 12, 2024
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[![Coverage](https://codecov.io/gh/ITensor/ITensorMPS.jl/branch/main/graph/badge.svg)](https://codecov.io/gh/ITensor/ITensorMPS.jl)
[![Code Style: Blue](https://img.shields.io/badge/code%20style-blue-4495d1.svg)](https://github.com/invenia/BlueStyle)

MPS and MPO methods based on ITensor (ITensors.jl).
Finite MPS and MPO methods based on ITensor (ITensors.jl).

This package currently re-exports the MPS and MPO functionality of the [ITensors.jl](https://github.com/ITensor/ITensors.jl) and [ITensorTDVP.jl](https://github.com/ITensor/ITensorTDVP.jl) packages, including applications like DMRG, TDVP, applying MPO to MPS, applying gates, etc.
This package currently re-exports the MPS and MPO functionality of the [ITensors.jl](https://github.com/ITensor/ITensors.jl) and [ITensorTDVP.jl](https://github.com/ITensor/ITensorTDVP.jl) packages, including applications like DMRG, TDVP, applying MPO to MPS, applying gates to MPS and MPO, etc.

The goal will be to move the MPS and MPO code from those packages into this repository, and for the `ITensorMPS.jl` package to be the primary entry point for the finite MPS and MPO functionality of ITensor.
See the [ITensor documentation](https://itensor.github.io/ITensors.jl/dev) and the [ITensorTDVP.jl examples](https://github.com/ITensor/ITensorTDVP.jl/tree/main/examples) for guides and examples on using this package.

## Upgrade guide

The goal will be to move the MPS and MPO code from the ITensors.jl package, along with all of the code from the [ITensorTDVP.jl](https://github.com/ITensor/ITensorTDVP.jl) package, into this repository. If you are using any MPS/MPO functionality of ITensors.jl, such as the `MPS` and `MPO` types or constructors thereof (like `randomMPS`), `OpSum`, `siteinds`, `dmrg`, `apply`, etc. you should install the ITensorMPS.jl package with `import Pkg; Pkg.add("ITensorMPS")` and add `using ITensorMPS` to your code. Additionally, if you are currently using [ITensorTDVP.jl](https://github.com/ITensor/ITensorTDVP.jl), you should replace `using ITensorTDVP` with `using ITensorMPS` in your codes.
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