DiagonalMatrixQ

DiagonalMatrixQ(matrix)

DiagonalMatrixQ(matrix, diagonal)

returns True if all elements of the matrix are 0 except the elements on the diagonal.

Examples

>> DiagonalMatrixQ({{a, 0, 0}, {b, 0, 0}, {0, 0, c}})
False

>> DiagonalMatrixQ({{0, a, 0, 0}, {0, 0, b, 0}, {0, 0, 0, c}}, 1)
True

>> DiagonalMatrixQ({{0, a, 0, 0}, {0, 0, b, 0}, {0, 0, c, 0}}, -1)
False

>> DiagonalMatrixQ({{0, 0, 0, 0}, {a, 0, 0, 0}, {0, b, 0, 0}}, -1)
True

Implementation status

• ✅ - full supported

Github

• Implementation of DiagonalMatrixQ