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Mathematica > Constructing Matrices >

Built-in Mathematica Symbol

DiagonalMatrix

DiagonalMatrix[list]
gives a matrix with the elements of list on the leading diagonal, and 0 elsewhere.

DiagonalMatrix[list, k]
gives a matrix with the elements of list on the k

diagonal.

For positive k, DiagonalMatrix[list, k] puts the elements k positions above the main diagonal. DiagonalMatrix[list, -k] puts the elements k positions below.

DiagonalMatrix[list, k] fills the k diagonal of a square matrix with the elements from list. Different values of k lead to different matrix dimensions.