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#' ply1
#'
#' ply1 -internal function; not exported.
#'
#' @param q integer
#' @return Hadamard matrix of order 2(q+1)
#'
#' @references
#' Paley, R.E.A.C. (1933). On Orthogonal matrices. J. Combin. Theory, A 57(1), 86-108.
#'
ply1<-function(q){
A<- qhad2(q)
et <- matrix(c(rep(1,q)),nrow=1,ncol=q)
e <- matrix(c(rep(1,q)),nrow=q,ncol=1)
S1 <- cbind(0,et)
S2 <- cbind(e,A)
S <- rbind(S1,S2)
a<-matrix(c(0,-1,1,0),ncol = 2,nrow = 2)
h<-2
Id<-diag(h/2)
Uh<- Id %x% a
Ah<-had_kronecker(h)
Bh<- Uh %*%Ah
H1<- Ah %x% diag(q+1)
H2<- Bh %x% S
H<- H1+H2
return(H)
}
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