Nothing
t_stats <- function(M, ind1, ind2, sigma_sq, z){
if (ind1 != ind2){
n <- nrow(M)
Tmat <- matrix(0, n, n)
ind <- t(utils::combn(1:n, 2))
x <- as.matrix(M[ind[, 1],] - M[ind[, 2], ])
if (ncol(x) == 1) x <- t(x)
Tmat[ind] <- ((x%*%z)^2)/(sigma_sq*(apply(x, 1, function(y) t(y)%*%y)))
Tmat <- cbind(0, Tmat)
t_st <- c(0, ((M%*%z)^2)/(sigma_sq*(apply(M, 1, function(y) t(y)%*%y))))
Tmat <- rbind(t_st, Tmat)
} else {
Tmat <- matrix(c(0, 0, ((M%*%z)^2)/(sigma_sq*sum(M^2)),0), 2, 2) #A. Prochenka, PhD Thesis, Algorithm 1, Calculate squared t-statistics for all elementary constraints defined in (2.2)
}
return(Tmat)
}
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