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SparseArrays.jl provides functionality for working with sparse arrays in Julia.
This package ships as part of the Julia stdlib, so its version is tied to the Julia version: each Julia release bundles a fixed copy, and it cannot be upgraded separately.
using SparseArrays, LinearAlgebra
A = sparse([1, 2, 3, 3], [1, 2, 1, 3], [4.0, 5.0, 1.0, 6.0]) # rows, columns, values
A[3, 1] # 1.0
nnz(A) # 4 stored entries
x = A \ ones(3) # sparse direct solve through SuiteSparseDevelopment happens against Julia nightly. To run the tests:
julia +nightly --project -e 'using Pkg; Pkg.test()'AGENTS.md has the conventions this repository follows, the commands for running a single test file, the whitespace check and the doctests, and pointers to the guides for the solvers, the test suite and upgrading SuiteSparse.