HABQT alternatives and similar packages
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vector
An efficient implementation of Intindexed arrays (both mutable and immutable), with a powerful loop optimisation framework . 
statistics
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numhask
A haskell numeric prelude, providing a clean structure for numbers and operations that combine them. 
cf
"Exact" real arithmetic for Haskell using continued fractions (Not formally proven correct) 
poly
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optimization
Some numerical optimization methods implemented in Haskell 
safedecimal
Safe and very efficient arithmetic operations on fixed decimal point numbers 
equationalreasoning
Agdastyle equational reasoning in Haskell 
eigen
Haskel binding for Eigen library. Eigen is a C++ template library for linear algebra: matrices, vectors, numerical solvers, and related algorithms. 
diagramssolve
Miscellaneous solver code for diagrams (lowdegree polynomials, tridiagonal matrices)
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README
HABQT
Aim of the project is to extend adaptive Bayesian quantum tomography as described in 2012 paper by Huszár and Houlsby by using a hierarchical distribution over density matrices of all possible ranks.
Includes:
 a Haskell library
 a shared library which provides a C interface to the tomography function
 an executable that simulates tomography of random states and outputs infidelity between true states and mean Bayesian estimates to a file
Please refer to HABQTsimulation help
for executable usage instructions,
accompanying Haddock documentation for Haskell API, and [libHABQT header
file](./libHABQT.h) for shared library C ABI description.
Installation instructions
Linux
No special setup should be necessary. Simply make sure GSL, BLAS and LAPACK are installed on your system and install normally using stack, cabal or Setup.hs.
Windows
Making the necessary shared libraries and tools available on windows can be a
bit tricky. One way to do this is install them inside MSYS2 that comes with
stack on windows (on x86_64 can be found under
%LOCALAPPDATA%\Programs\stack\x86_64windows
):
 MSYS may not be present, in which case execute
stack build
in HABQT directory. The build will fail due to missing libraries/tools, but MSYS should be installed after it, and you will be able to add them.  Launch msys2.exe
 (Optional) Update MSYS2 with
pacman Syu
. It may be necessary to restart the shell: follow the instructions displayed in it.  Install the appropriate mingw toolchain, which includes necessary tools like
pkgconfig. E.g.
pacman S mingww64x86_64toolchain
 Install GSL for the appropriate mingw toolchain (the 64bit one this case):
pacman S mingw64/mingww64x86_64gsl
 Install openblas for appropriate mingw toolchain:
pacman S mingw64/mingww64x86_64openblas
 The versions/naming conventions hmatrix expects differ from what is used in
modern MSYS2, so it's necessary to either link of create renamed copies of
two libraries from the appropriate mingw toolchain (in my case found under
%LOCALAPPDATA%\Programs\stack\x86_64windows\msys220150512\mingw64\bin
):libgfortran4.dll
tolibgfortran.dll
andlibgslcblas0.dll
togsl0.dll
. I recommend placing links/copies in some directory that isn't normally on PATH (neither windows nor MSYS) and explicitly pointing stack to them during installation withextralibdirs
(example follows in next step).  Outside MSYS2 open a normal windows shell, navigate to HABQT folder and
build/install with stack, passing appropriate flags and library dirs:
stack build flag hmatrix:openblas extralibdirs=D:\lib
whereD:\lib
containslibgfortran.dll
andgsl0.dll
.
To use the shared library or executable, you’ll need to have several mingw libraries on PATH or in the same directory: libgcc_s_seh1.dll, libgfortran4.dll, libgsl23.dll, libgslcblas0.dll, libopenblas.dll, libquadmath0.dll and libwinpthread1.dll.