Description Usage Arguments Details Value References Examples
had_ehlich performs the construction of Hadamard matrix by Ehlich method
1 | had_ehlich(x)
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x |
Integer (order of the Hadamard matrix) |
Ehlich (1965)'s construction method requires order of the Hadamard matrix must be a of the form (n-1)^2. Conditions are (i)Order=(n-1)^2; (ii) n is a prime or prime power and 3(mod 4); (iii) (n-2) must be a prime or prime power. In case, if all the three conditions are satisfied,then function will return Hadamard matrix of order x otherwise NULL.
Hadamard matrix of order x
Ehlich, H. (1965). Neue Hadamard-matrizen. Arch. Math., 16, 34-36.
1 2 3 | had_ehlich(36)
had_ehlich(20)
#NULL
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