---
tag: 044JNC7ZAA
kind: concept
name: Diagonal matrix
msc: [15A99]
sources:
  - url: https://en.wikipedia.org/wiki/Diagonal_matrix
    locator: lead section
same_as:
  wikidata: Q332791
  wikipedia: Diagonal matrix
---

## Summary

A diagonal matrix is a square matrix whose entries outside the main diagonal are all zero.