JuliaDynamics/RecurrenceAnalysis.jl

Improve performance with `fixedrate=true`

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#47 opened on Jan 17, 2019

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Description

In the calculation of recurrence matrices with fixed recurrence rate there is the issue commented in #46 (indirectly calling distancematrix, which is expensive):

https://github.com/JuliaDynamics/RecurrenceAnalysis.jl/blob/2961a32b29e41ea1e3dc3d63f67e29d74948e5ab/src/matrices.jl#L220-L222

A function that gives the same result as quantile(distancematrix(x,y), ε) without calling distancematrix would help.

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Contributor guide

Research direction
Implement a function to compute the quantile of distances without constructing the full distance matrix, possibly using a selection algorithm like Quickselect or a sampling approach.
Tech stack
julia
Domain
data
Issue type
Performance
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
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Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
JuliaGit
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60