SparseArraysBaseNext.jl

Installation instructions

julia> using Pkg: Pkg

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

Examples

using SparseArraysBaseNext:
  SparseArrayDOK, eachstoredindex, isstored, storedlength, storedpairs, storedvalues
using Test: @test

a = SparseArrayDOK{Float64}(2, 2)
a[1, 2] = 12
a[2, 1] = 21
@test a[1, 1] == 0
@test a[2, 1] == 21
@test a[1, 2] == 12
@test a[2, 2] == 0

b = a .+ 2 .* a'
@test b[1, 1] == 0
@test b[2, 1] == 21 + 2 * 12
@test b[1, 2] == 12 + 2 * 21
@test b[2, 2] == 0
@test issetequal(storedvalues(b), [21 + 2 * 12, 12 + 2 * 21])
@test issetequal(eachstoredindex(b), [CartesianIndex(2, 1), CartesianIndex(1, 2)])
@test storedpairs(b) ==
  Dict(CartesianIndex(2, 1) => 21 + 2 * 12, CartesianIndex(1, 2) => 12 + 2 * 21)
@test !isstored(b, 1, 1)
@test isstored(b, 2, 1)
@test isstored(b, 1, 2)
@test !isstored(b, 2, 2)
@test storedlength(b) == 2

c = a * a'
@test storedlength(c) == 2
@test c == [12*12 0; 0 21*21]

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