March 30, 2020 Dataset Open Access

Östergård, Patric R J; Paavola, William T

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    <subfield code="a">Dataset for Quaternary Complex Hadamard Matrices of Order 18</subfield>
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    <subfield code="a">&lt;p&gt;The files contain the quaternary complex Hadamard matrices of order 18 classified in the work &amp;quot;Patric R. J. &amp;Ouml;sterg&amp;aring;rd and William T. Paavola, Quaternary Complex Hadamard Matrices of Order 18&amp;quot;.&lt;/p&gt;

&lt;p&gt;Each file bh18-t&lt;strong&gt;n&lt;/strong&gt;.txt contains the matrices of type &lt;strong&gt;n&lt;/strong&gt; up to Hadamard equivalence. Each matrix is expressed as a human-readable 18 by 18 array of &lt;strong&gt;x&lt;/strong&gt;&amp;isin;{0,1,2,3} such that the corresponding elements of each matrix are given by raising the imaginary unit to the power of &lt;strong&gt;x&lt;/strong&gt;. Each array is followed by a single row that contains the size of the stabilizer of the matrix.&lt;/p&gt;</subfield>
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