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ITensors v0.1.21 Release Notes

  • Add parity conservation to S=1/2 sitetype (PR #467)
    • Add "ProjUp" and "ProjDn" operator definitions to S=1/2 site type.
    • Change QN name "Pf" to "NfParity"
    • Add keyword arguments to choose the QN names when making siteinds.
  • Add ! as not syntax (PR #471)
    • Add @ts_str macro for TagSet construction
  • Add Sweeps constructor from matrix of parameters (PR #472)
  • Add examples of input files (PR #473)
    • Add native ITensors argument parsing with the argsdict() function.
    • Add examples of using ITensors with input files and ArgParse.jl and argsdict().

ITensors v0.1.20 Release Notes

  • Make ITensors compatible with Julia v1.3 (#468)
  • New function filterinds, alias for inds (#466)
  • Add QN ITensor from Array constructor (#464)

ITensors v0.1.19 Release Notes

  • Add setindex!(::MPS, _, ::Colon) (PR #463)
    • Set new limits to limits of input MPS
  • Add macros for warn ITensor order (PR #461)
    • Add macros for warn ITensor order
    • Shorten warn ITensor order function name (breaking for anyone who managed to use them in the short time they existed).
  • Make map for MPS reset the orthogonality limits (PR #460)
    • Makes map and map! reset the orthogonality limits by default.
    • Add keyword argument set_limits to map and map! to let users turn on and off setting the orthogonality limits (so it can be turned off for cases like priming).
    • Add orthogonalize, an out-of-place version of orthogonalize!.
    • Add SiteType"S=\1/2" as an alias for SiteType"S=1/2".

ITensors v0.1.18 Release Notes

  • Add functions for controlling warn itensor order (PR #458)
  • Add pair syntax to mapprime, replacetags, and replaceinds (PR #459)

ITensors v0.1.17 Release Notes

  • Miscellaneous new ITensor and MPS/MPO functionality (PR #457):
    • Add eachindex(T::ITensor) to return an iterator over each cartesian index of an ITensor (i.e. for an d x d ITensor, either 1:d^2 or (1,1), (1,2), ..., (d, d)). For sparse ITensors, this includes structurally zero and nonzero entries.
    • Add iterate(A::ITensor, args...), which allows using for a in A @show a end to print all elements (zero and nonzero, for sparse tensors).
    • Add setindex!(T::ITensor, x::Number, I::CartesianIndex) to allow indexing with a CartesianIndex, which is naturally returned by functions like eachindex.
    • Add hasplev(pl::Int) that returns a function x -> hasplev(x, pl) (useful in functions like map).
    • Add hasind[s](i::Index) that returns a function x -> hasind[s](x, i) (useful in functions like map).
    • Add hascommoninds(A, B; kwargs...) which returns true if A and B have common indices.
    • Add findfirstsiteind(M::MPS/MPO, s::Index) that returns which site of the MPS/MPO has the site index s.
    • Add findfirstsiteinds(M::MPS/MPO, is) that returns which site of the MPS/MPO has the site indices is.
    • Add linkinds(::MPS/MPO) that returns a vector of the link indices.
    • Add linkdim(::MPS/MPO, ::Int) that returns the dimension of the specified link, and nothing if there is no link found.
    • Add linkdims(::MPS/MPO) that returns a vector of the link dimensions.
    • Fix a bug in +(::MPST, ::MPST) that the inputs were getting modified (the inputs were getting orthogonalized and the prime levels were beging modified).
    • Add productMPS(sites, state::Union{String, Int}) to create a uniform MPS (for example, productMPS(sites, "Up") makes a state with all Up spins).
  • Add QR option for factorize (only Dense tensors so far). Used by default if not truncation is requested (PR #427)

ITensors v0.1.16 Release Notes

  • Update physics site definitions to user newer overload style (PR #453)
  • Fix some issues with precompile_itensors.jl code and automatically test it (PR #452)

ITensors v0.1.15 Release Notes

  • Add multi-site op support (PR #444)
  • Update state system to be user-extensible using StateName (PR #449)
  • Update siteinds system to be more easily extensible using space and siteind functions (PR #446)
  • Remove parenthesis from AutoMPO syntax from tests and examples (PR #448)

ITensors v0.1.14 Release Notes

  • Fix AutoMPO issue #440 (PR #445)
  • Have ITensors.compile() compile QN DMRG (PR #442)
  • Make linkind return nothing for all links outside the boundary of the MPS (PR #441)

ITensors v0.1.13 Release Notes

  • New ITensors.compile() routine (PR #436, PR #439)
  • Propagate keyword args through orthogonalize! (PR #438)
  • Speed improvement to op (PR #435)
  • Major improvements to op function system (PR #406)

ITensors v0.1.12 Release Notes

  • HDF5 Support for QNITensors, QNIndex (PR #433)
  • Add ProjMPO_MPS to exports

ITensors v0.1.11 Release Notes

  • Add tests for contraction bug. Add tests for extended Spectrum definition (PR #432)
  • Add ProjMPO_MPS to exports

ITensors v0.1.10 Release Notes

  • Fix missing return statement in QNVal constructor (PR #431)

ITensors v0.1.9 Release Notes

  • Fix bug with AutoMPO dimension in certain cases (PR #426)

ITensors v0.1.8 Release Notes

  • Fix a bug in broadcast and in-place contraction (#425)

ITensors v0.1.7 Release Notes

  • Add Unicode support for SmallStrings/Tags (PR #413)
  • Speed up small ITensor contractions (PR #423)
  • Add swapsites keyword argument to replacebond (PR #420)
  • Change flux(::AbstractMPS) to return nothing in non-QN case (PR #419)

ITensors v0.1.6 Release Notes

  • Allow user to control Arrow direction of combined Index in combiner (PR #417)
  • Fix eigen for case when left/right indices had mixed Arrow directions (PR #417)
  • Add exp for QN ITensor (PR #402)
  • Add Advanced Usage Guide to docs (PR #387)

ITensors v0.1.5 Release Notes

  • Fix bug with combiner (uncombining step) when combined Index is not the first one (PR #401)
  • Add check to ProjMPO to ensure result of product is same order as input tensor (PR #390)

ITensors v0.1.4 Release Notes

  • Add note to docs about requiring Julia 1.4 currently
  • Improve error message for non-scalar input to scalar (PR #396)
  • Export @TagType_str macro (PR #393)
  • Fix productMPS for complex element type (PR #392)

ITensors v0.1.3 Release Notes

  • Use NDTensors v0.1.3, which fixes a bug when taking the SVD of a complex QN ITensor.

ITensors v0.1.2 Release Notes

  • Add functions norm(::MPS), norm(::MPO), inner(::MPO, ::MPO), as well as logdot/loginner and lognorm for getting the logarithm of the inner product or norm between MPSs/MPOs.