heatmap

Use for two discrete categories (x and series) with a numeric intensity (y). Long form only: one row per cell. Keep first-seen category order. series is required.

Do not use for a single category comparison (bar) or a continuous scatter cloud (scatter).

x category · y number (intensity) · series required (category)

Rules. Long form only. Keep row order. Both cats discrete. Empty y is a missing cell, not zero. Optional min/max share the color domain across figures.

Example

markvis: 2
type: heatmap
title: Eight o'clock still packs Five Points entries
x: hour
y: entries
series: weekday

hour,weekday,entries
7am,Mon,420
8am,Mon,880
9am,Mon,610
7am,Tue,390
8am,Tue,910
9am,Tue,640

Eight o'clock still packs Five Points entries

hour	weekday	entries
7am	Mon	420
8am	Mon	880
9am	Mon	610
7am	Tue	390
8am	Tue	910
9am	Tue	640

When the block is wrong

The rows stay, with one line that names the error.

markvis: 2
type: heatmap
title: Missing series
x: hour
y: entries

hour,weekday,entries
7am,Mon,420
8am,Tue,880

hour	weekday	entries
7am	Mon	420
8am	Tue	880

E_UNKNOWN_FIELD: heatmap requires series

Generated from packages/types/heatmap/ and the type's row in SPEC.md.