cdn_goethals_T {HadamardR}

cdn_goethals_T

Description

Checks Hadamard Matrix can be constructed using available T-sequences.

Usage

cdn_goethals_T(order)

Arguments

order

integer

Details

This function checks whether the Hadamard matrix of given order can be constructed using T sequences. If T sequences of length n,n,n,n are available, Hadamard matrix of order 4n can be constructed. Returns the value 13, if it is possible otherwise NULL is returned.

T-sequences are available for length of seq(1,73,2) and for 83, 101 and 107 in the internal table.

Value

13 or NULL

See Also

had_goethals_T for Goethals-Seidel construction method using T-sequences.

Examples

cdn_goethals_T(28)
#T-seqeunce of length 7 exists.
#13
cdn_goethals_T(24)
#T-sequence of length 6 does not exist.
#NULL