The FFT algorithms are described which, like those described by Rader and Brenner, use pure real (or imaginary) constant factors. Since these factors contain <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">cos(2/N)</tex> (or <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">sin(2/N)</tex> ), these processes are somewhat better conditioned than those of Rader/Brenner, and are comparably efficient.
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Cho et al. (2005) studied this question.
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