JuliaLang/julia

single-argument accumulate!, cumsum!, cumprod!, etc.?

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#33,599 opened on Oct 17, 2019

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Description

I assumed before reading the docs that cumsum!(v) would accumulate v and store the result in-place, but it was a no method error. Doing cumsum!(v, v) seems to work; is there any reason not to make cumsum!(v) a shorthand for cumsum!(v, v)? Likewise with all accumulators.

Contributor guide

Research direction
Implement a method `cumsum!(v) = cumsum!(v, v)` for Vector and similar changes for `cumprod!`, `accumulate!`, etc. Ensure no method ambiguity.
Tech stack
julia
Domain
backend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
1
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Under 1 hour
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
None
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
90