Nothing
#' @export
Z <- function(...){
Z <- matrix(c(1,0,0,-1),nrow=2,ncol=2)
ket <- list(...)
if(length(ket) == 0){
Z
} else {
k <- Z %*% ket[[1]]
if(abs(k[1,1]) != 0)
k <- k/k[1,1]
ket(k[1,1],k[2,1])
}
}
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