Randomized trial demonstrates improved efficiency in convergence acceleration, highlighting its superiority to existing methods.
An improved version of the direct inversion in the iterative subspace algorithm is developed. The method is significantly more efficient than the previous version, and is applicable to intrinsically divergent or slowly convergent cases. Comparisons indicate that the method is superior to the recently proposed quadratically convergent ( QC – SCF ) method of Bacskay.
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P. Pulay (1982) studied this question.
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