JuliaArrays / JuliaArrays/BlockArrays.jl
Add `blockvcat`, `blockhcat`, and `blockhvcat`
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- Dominant language
- Julia
- Stars
- 254
- Forks
- 39
- PR merge metrics
- No merged PRs in 30d
Description
We should add blockvcat(A,B,...) that produces a blocked array. For example blockvcat(1:5,10:12)[Block(1)] == 1:5. But also supporting the case whereA and B are blocked, where the block structure is concatenated. An initial prototype is here
https://github.com/JuliaMatrices/LazyBandedMatrices.jl/blob/master/src/blockconcat.jl
Following blockkron we first produce lazy versions. We may also want to add a macro, something like:
@blocked [A; B] # lowers to blockvcat(A,B)
@blocked [A B] # lowers to blockhcat(A,B)
@blocked [A B; C D] # lowers toblockhvcat(2, A, B, C, D)
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First steps
- Read the whole issue, then the project's contributing guide.
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Research direction
Start with the prototype in src/blockconcat.jl and compare its approach with blockkron. Define the lazy blockvcat, blockhcat, and blockhvcat behavior for ordinary and blocked inputs, then assess the proposed @blocked macro; the work is done when these concatenation forms preserve the requested block structure.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- julia
- Domain
- data
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100