Aliases: paley is.hadamard
### ** Examples M<-paley(11) is.hadamard(M)
[1] TRUE
## internals of is.hadamard(M) H<-2*M-1 ## HH^T is diagonal for any Hadamard matrix H%*%t(H)
[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11] [,12] [1,] 12 0 0 0 0 0 0 0 0 0 0 0 [2,] 0 12 0 0 0 0 0 0 0 0 0 0 [3,] 0 0 12 0 0 0 0 0 0 0 0 0 [4,] 0 0 0 12 0 0 0 0 0 0 0 0 [5,] 0 0 0 0 12 0 0 0 0 0 0 0 [6,] 0 0 0 0 0 12 0 0 0 0 0 0 [7,] 0 0 0 0 0 0 12 0 0 0 0 0 [8,] 0 0 0 0 0 0 0 12 0 0 0 0 [9,] 0 0 0 0 0 0 0 0 12 0 0 0 [10,] 0 0 0 0 0 0 0 0 0 12 0 0 [11,] 0 0 0 0 0 0 0 0 0 0 12 0 [12,] 0 0 0 0 0 0 0 0 0 0 0 12