Nothing
############
# moran.idx
############
moran.idx <- function(x, prox, addInfo=FALSE){
## handle arguments
if(any(is.na(x))) stop("NA entries in x")
if(!is.numeric(x)) stop("x is not numeric")
W <- as.matrix(prox)
if(!is.matrix(W)) stop("prox is not a matrix")
if(ncol(W) != nrow(W)) stop("prox is not a square matrix")
if(any(is.na(W))) stop("NA entries in prox")
diag(W) <- 0
n <- nrow(W)
## main computations
x <- x - mean(x)
sumW <- sum(W)
num <- n * sum(x * (W %*% x) )
denom <- sumW * sum(x*x)
if(denom < 1e-14) stop("denominator equals zero")
res <- num/denom
if(addInfo){
I0 <- -1/(n-1)
matToDiag <- .5 * (t(W) + W)
rangeI <- range(eigen(matToDiag)$values)
attr(res, "I0") <- I0
attr(res, "Imin") <- rangeI[1]
attr(res, "Imax") <- rangeI[2]
}
return(res)
} # end moran.idx
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