A **bidiagonal matrix** is a specific type of square matrix that has non-zero elements only on the main diagonal and either the diagonal directly above or directly below it. In other words, it can be classified into two types: 1. **Upper Bidiagonal Matrix**: A square matrix where non-zero elements are present on the main diagonal and the diagonal right above the main diagonal.
Articles by others on the same topic
A bidiagonal matrix has nonzero entries only on its main diagonal and one adjacent diagonal. The upper bidiagonal matrix uses the superdiagonal; the lower version uses the subdiagonal.