# matrix

Heatmap: a dense matrix — `{ columns, rows, values }` (row-major) or rows of columns. Property-only.

Canonical: https://chart.syidax.com/docs/options/matrix/

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## Definition

| Item | Value |
| --- | --- |
| JavaScript property | `matrix` |
| HTML attribute | Pass objects, arrays, and callbacks as JavaScript properties |
| Type | `HeatmapMatrixInput` |
| Default | `undefined` |

undefined means this property was not explicitly set. The effective value may depend on the chart type and other settings.

- [HeatmapMatrixInput](https://chart.syidax.com/docs/types/HeatmapMatrixInput.md) — Type definition

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## Related documentation

A property with the same name may have different types and defaults across charts. When using a direct tag, follow that chart's documentation below.

- [Shared facade and direct tags](https://chart.syidax.com/docs/concepts.md)
- [sy-heatmap](https://chart.syidax.com/docs/components/heatmap.md#property-matrix)