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Issue No.05 - May (1971 vol.20)
pp: 588-590
S.R. Webb , Mathematical Sciences Dep. Inform. Sys. Div. McDonnell Douglas Astronautics Co.
ABSTRACT
An algorithm for a fast matrix transform of order twelve was given by Pratt [1]. The resulting transform matrix consists of plus and minus ones, is in order of sequency, but is not orthogonal, and hence is not a Hadamard matrix. This note proves it is impossible to construct a Hadamard matrix of order twelve with this increasing sequency property and gives a corrected algorithm of order twelve.
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