observablehq / observablehq/plot

More support for labels with channel reducers and values

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#1,364 4 comments 0 reactions 0 assignees View on GitHub

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enhancement
Dominant language
HTML
Stars
5.4k
Forks
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PR merge metrics
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Description

This should display "# of specimens" as the y label:

Plot.barY(
  penguins,
  Plot.groupX(
    {
      y: {reduce: "count", label: "# of specimens"},
      fill: (values) => d3.mode(values)
    },
    {x: "species", fill: "island", fy: "sex"}
  )
);

Excerpted from #1360

First tentative: https://github.com/observablehq/plot/commit/9dfeb79bd757d868771ce10bf24270feee5ee587

Contributor guide

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with the Plot.barY and Plot.groupX usage shown in the issue, then review tentative commit 9dfeb79bd757d868771ce10bf24270feee5ee587. Trace how the reducer and its label are handled, and verify that the example displays "# of specimens" as the y-axis label.

Written by the indexing model from the issue text.

Assessment

Tech stack
d3
Domain
data-visualization
Issue type
Feature
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
38/100

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