Bidiagonal matrix

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A bidiagonal matrix is a symmetric tridiagonal matrix, a special type of matrix representation from the LAPACK Fortran package.

A symmetric tridiagonal or bidiagonal matrix is stored in two one-dimensional arrays, one of length n containing the diagonal elements, and one of length n-1 containing the off-diagonal elements. (EISPACK routines store the off-diagonal elements in elements 2:n of a vector of length n.)

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