An unsymmetric tridiagonal matrix of order is stored in three one-dimensional arrays, one of length containing the diagonal elements, and two of length containing the subdiagonal and superdiagonal elements in elements .

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

Tue Nov 29 14:03:33 EST 1994