BlockSparseArrays.jl

A block sparse array type in Julia based on the BlockArrays.jl interface.

Support

BlockSparseArrays.jl is supported by the Flatiron Institute, a division of the Simons Foundation.

Installation instructions

This package resides in the ITensor/ITensorRegistry local registry. In order to install, simply add that registry through your package manager. This step is only required once.

julia> using Pkg: Pkg

julia> Pkg.Registry.add(url="https://github.com/ITensor/ITensorRegistry")

or:

julia> Pkg.Registry.add(url="git@github.com:ITensor/ITensorRegistry.git")

if you want to use SSH credentials, which can make it so you don't have to enter your Github ursername and password when registering packages.

Then, the package can be added as usual through the package manager:

julia> Pkg.add("BlockSparseArrays")

Examples

using BlockArrays: Block
using BlockSparseArrays: BlockSparseArray, blockstoredlength
using Test: @test

a = BlockSparseArray{Float64}(undef, [2, 3], [2, 3])
a[Block(1, 2)] = randn(2, 3)
a[Block(2, 1)] = randn(3, 2)
@test blockstoredlength(a) == 2
b = a .+ 2 .* a'
@test Array(b) ≈ Array(a) + 2 * Array(a')
@test blockstoredlength(b) == 2

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