Aligning histograms and density plots
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- Dominant language
- Rust
- Stars
- 554
- Forks
- 30
- Avg merge
- 17h 27m
- Merged PRs (30d)
- 8
Description
We currently have an example in the density documentation where this works out reasonably well by accident.
However if we pick flipper_len instead of bill_len we see misalignment happening.
VISUALISE flipper_len AS x FROM ggsql:penguins
DRAW histogram
REMAPPING density AS y
SETTING opacity => 0.5
DRAW density
SETTING opacity => 0.5
Currently the histogram density is computed as:
{count} * 1.0 / SUM({count})
To get good alignment with the density layer, we'd need to account for the binwidth as well.
I'm proposing the current histogram density variable becomes fraction or something, and have a new density computation that divides by the binwidth.
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by locating the histogram density computation and the density layer handling in the Rust implementation, then reproduce the documented example with flipper_len. Compare the histogram and density outputs across bin widths; done means the layers align while the existing fraction-like behavior remains clearly defined.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- rust, sql
- Domain
- data-visualization
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Quiet
- Clarity
- Mostly clear
- Newbie friendliness
- 48/100