JuliaPlots/Plots.jl

Sparsify Data

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#847 opened on May 20, 2017

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 (4 comments) (0 reactions) (0 assignees)Julia (1,943 stars) (381 forks)batch import
enhancementgood first issue

Description

Sometimes I have millions of data points to plot, e.g., with scatter. This is extremely inefficient so I first sparsity them by throwing away points that are close within some tolerance of already existing points.

Surely this must come up on a regular basis. Maybe this is something that should be left with the user, but I thought I'd mention it as a possible feature for Plots?

Contributor guide

Tech stack
None
Domain
performancedata
Issue type
feature
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.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
familiarity with Plots.jlunderstanding of data downsampling
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
20
Research direction
Investigate existing downsampling algorithms for scatter plots (e.g., Douglas Peucker or LTTB). Review comments on issue #847 for user expectations. Explore Plots.jl source to find where data is passed to backends and where a sparsification step could be inserted.