SciML / SciML/RecursiveArrayTools.jl

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

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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.

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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.

Assessment

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

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