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

FilledSmallSquare See The Mathematica Book: Section 1.8.3 and Section 3.7.1.

FilledSmallSquare See also: IdentityMatrix, Tr, KroneckerDelta.

FilledSmallSquare Related package: LinearAlgebra`MatrixManipulation`.

Further Examples