Principles of Coding, Filtering and Information Theory

P. M. Woodward
1966 Computer journal  
It is not possible to factorize the right-hand side of this formula, and so it cannot be split into Peaceman-Rachford form like (5). As a result the examination of the convergence of the procedure is considerably more difficult and the method more complicated than the method of the present paper. The second attempt was by Cannon and Douglas (1964) who proposed a threelevel alternating-direction iterative method. The presence of the extra level, of course, adds undue complication to the
more » ... ion to the numerical procedure. Acknowledgements The calculations were carried out on the IBM 1620
doi:10.1093/comjnl/9.3.303-b fatcat:lw7n7p2hn5efxhzye76pchxfsm