The conclusion reached in a recent paper by Morf [ J. Opt. Soc. Am. A 12, 1043 ( 1995)], that the algorithm he proposed is several times faster than the R-matrix algorithm presented in an earlier paper of mine [ J. Opt. Soc. Am. A 10, 2581 ( 1993)], is erroneous. By providing operation count, I show that the R-matrix algorithm, when it is applied to the classical modal method, is as efficient as Morf’s algorithm.
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