Hacktoberfest 2026: the issues maintainers tagged for October, open and beginner-friendly. Browse Hacktoberfest issues

Using UpperTriangular and LowerTriangular arrays (or maybe more generally AbstractArrays?)

Open
#451 0 comments 0 reactions 0 assignees View on GitHub

Nobody has claimed this yet.

Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
35/100
Issue type
Feature
Clarity
Needs clarification
Activity status
Stale
Tech stack
julia
Domain
data

Research direction

Start with ArrayPartition behavior and the linked Discourse thread, then check how UpperTriangular, LowerTriangular, UnitUpperTriangular, and UnitLowerTriangular arrays currently behave. Define the supported scope, including whether sparse or diagonal arrays are included, and verify that supported types work as they normally would when used in an ArrayPartition.

Written by the indexing model from the issue text.

Description

Related to this discourse thread.

Currently, UpperTriangular, LowerTriangular, UnitUpperTriangular and UnitLowerTriangular arrays don't seem to be fully supported. It would be great if those could also be implemented to work exactly as they would normally if they are used in an ArrayPartition. I have not yet checked for different types of arrays, but perhaps the other special array types (sparse, diagonal, etc. ) would also be nice to add if they don't work yet.

Dominant language
Julia
Stars
233
Forks
76
Avg merge
5h 33m
Merged PRs (30d)
11

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

More from SciML/RecursiveArrayTools.jl

All issues in SciML/RecursiveArrayTools.jl

Similar issues

More Julia issues

Get new issues in your inbox

A short digest of beginner-friendly GitHub issues.