March 30, 2020 Dataset Open Access

Östergård, Patric R J; Paavola, William T

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    "description": "<p>The files contain the quaternary complex Hadamard matrices of order 18 classified in the work &quot;Patric R. J. &Ouml;sterg&aring;rd and William T. Paavola, Quaternary Complex Hadamard Matrices of Order 18&quot;.</p>\n\n<p>Each file bh18-t<strong>n</strong>.txt contains the matrices of type <strong>n</strong> up to Hadamard equivalence. Each matrix is expressed as a human-readable 18 by 18 array of <strong>x</strong>&isin;{0,1,2,3} such that the corresponding elements of each matrix are given by raising the imaginary unit to the power of <strong>x</strong>. Each array is followed by a single row that contains the size of the stabilizer of the matrix.</p>", 
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