| F01LEF | LU factorization of real tridiagonal matrix |
| F04LEF | Solution of real tridiagonal simultaneous linear equations (coefficient matrix already factorized by F01LEF) |
| F06RNF | 1-norm, ∞-norm, Frobenius norm, largest absolute element, real tridiagonal matrix |
| F06RPF | 1-norm, ∞-norm, Frobenius norm, largest absolute element, real symmetric tridiagonal matrix |
| F06UNF | 1-norm, ∞-norm, Frobenius norm, largest absolute element, complex tridiagonal matrix |
| F06UPF | 1-norm, ∞-norm, Frobenius norm, largest absolute element, complex Hermitian tridiagonal matrix |
| F08FEF | Orthogonal reduction of real symmetric matrix to symmetric tridiagonal form |
| F08FFF | Generate orthogonal transformation matrix from reduction to tridiagonal form determined by F08FEF |
| F08FSF | Unitary reduction of complex Hermitian matrix to real symmetric tridiagonal form |
| F08FTF | Generate unitary transformation matrix from reduction to tridiagonal form determined by F08FSF |
| F08GEF | Orthogonal reduction of real symmetric matrix to symmetric tridiagonal form, packed storage |
| F08GFF | Generate orthogonal transformation matrix from reduction to tridiagonal form determined by F08GEF |
| F08GSF | Unitary reduction of complex Hermitian matrix to real symmetric tridiagonal form, packed storage |
| F08GTF | Generate unitary transformation matrix from reduction to tridiagonal form determined by F08GSF |
| F08HEF | Orthogonal reduction of real symmetric band matrix to symmetric tridiagonal form |
| F08HSF | Unitary reduction of complex Hermitian band matrix to real symmetric tridiagonal form |
| F08JCF | All eigenvalues and optionally all eigenvectors of real symmetric tridiagonal matrix, using divide-and-conquer |
| F08JEF | All eigenvalues and eigenvectors of real symmetric tridiagonal matrix, reduced from real symmetric matrix using implicit QL or QR |
| F08JFF | All eigenvalues of real symmetric tridiagonal matrix, root-free variant of QL or QR |
| F08JGF | All eigenvalues and eigenvectors of real symmetric positive-definite tridiagonal matrix, reduced from real symmetric positive-definite matrix |
| F08JJF | Selected eigenvalues of real symmetric tridiagonal matrix by bisection |
| F08JKF | Selected eigenvectors of real symmetric tridiagonal matrix by inverse iteration, storing eigenvectors in real array |
| F08JSF | All eigenvalues and eigenvectors of real symmetric tridiagonal matrix, reduced from complex Hermitian matrix, using implicit QL or QR |
| F08JUF | All eigenvalues and eigenvectors of real symmetric positive-definite tridiagonal matrix, reduced from complex Hermitian positive-definite matrix |
| F08JXF | Selected eigenvectors of real symmetric tridiagonal matrix by inverse iteration, storing eigenvectors in complex array |