Table 4. Wall Times for the Edmiston–Ruedenberg Localization of the Occupied Orbitals of Gramicidin and Catenane Using the cc-pVDZ Basis and the Number of Macroiterations Needed to Reach Convergence (NiER)a.
| initial
guess |
|||||
|---|---|---|---|---|---|
| system | τ | tSCF | canonical | Cholesky | Foster–Boys |
| gramicidin | 10–2 | 2.65 h | 2.49 h | 1.47 h | 37.00 min |
| catenane | 21.95 min | 6.29 min | 3.72 min | 3.35 min | |
| gramicidin | 10–8 | 2.65 h | 14.59 h | 8.18 h | 3.67 h |
| catenane | 21.95 min | 28.44 min | 15.62 min | 12.41 min | |
Different initial guesses for the orbitals are compared: canonical, Cholesky, and Foster–Boys orbitals. The wall times used to converge the SCF equations (tSCF) are also given.