There are multiple ways to implement the storage data structure depending on the matrix type for optimization purpose.
Givens rotation is a rotation in the plane spanned by two coordinates axes.
A Hilbert matrix, H, is a symmetric matrix with entries being the unit fractions H[i][j] = 1 / (i + j -1)
A permutation matrix is a square matrix that has exactly one entry '1' in each row and each column and 0's elsewhere.
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