cdn_PaleyI {HadamardR}

cdn_PaleyI Checks Hadamard Matrix can be constructed using Paley I method.

Description

cdn_PaleyI Checks Hadamard Matrix can be constructed using Paley I method.

Usage

cdn_PaleyI(order)

Arguments

order

integer

Details

In Paley I method, if q=order-1 and q is prime number and q=3 (mod 4) then the function retuns 2 otherwise NULL.

Value

2 or NULL

References

Paley, R.E.A.C. (1933). On Orthogonal matrices. J. Combin. Theory, A 57(1), 86-108.

See Also

PaleyI for Paley I construction method.

Examples

cdn_PaleyI(8)
#2
cdn_PaleyI(16)
#NULL