Heatmap: Correlation Matrix [heatmap-correlation]

[MarkusNeusinger]

Plot Request

A correlation matrix heatmap showing pairwise correlations between variables.

Requirements

• Display correlation coefficients (-1 to 1) as colors
• Use diverging color scheme (blue-white-red)
• Show values in cells
• Variable names as axis labels
• Color bar legend

Data

Use a small dataset (4-6 variables) with correlated values.

Visual Quality

• Clear cell boundaries
• Readable text annotations
• Centered color scale at 0

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Test issue for per-library workflow validation

Implementation Status

Library	Status	Score	PR	Attempts
matplotlib	🧪 Testing	-	-	1/3
seaborn	⚙️ Generating	-	-	1/3
plotly	🧪 Testing	-	-	1/3
bokeh	🧪 Testing	-	-	1/3
altair	🧪 Testing	-	-	1/3
plotnine	🧪 Testing	-	-	1/3
pygal	🧪 Testing	-	-	1/3
highcharts	🧪 Testing	-	-	1/3

Last updated: 2025-12-01 21:06 UTC

[MarkusNeusinger]

Assigned ID: heatmap-correlation

This spec ID is manually assigned for workflow testing.

[claude]

✅ Spec ID Assigned

Assigned ID: heatmap-correlation

Rationale: This is the first heatmap spec in the repository, specifically designed for showing correlation matrices with diverging color schemes and value annotations.

Next Steps:

1. A maintainer will review this request
2. Once approved (label: approved), code generation will begin automatically
3. Implementations will be created for all 8 libraries

Spec will be created at: specs/heatmap-correlation.md