Nothing
#'@title Permutations
#'
#'@description Return permutations
#'
#'@param n Number of elements to permute
#'@keywords internal
#'@return Matrix of permuted element ids
permutations = function(n){
if(n == 1){
return(matrix(1))
} else {
sp = permutations(n-1)
p = nrow(sp)
A = matrix(nrow=n*p,ncol=n)
for(i in 1:n){
A[(i-1)*p+1:p,] = cbind(i,sp+(sp>=i))
}
return(A)
}
}
#'@title Find potential permuted interactions
#'
#'@description Returns permuted interactions
#'
#'@param x character vector of interaction terms
#'@keywords internal
#'@return character vector of potential interaction terms
potential_permuted_factors = function(x) {
numberterms = length(x)
if(numberterms == 1) {
return(x)
}
return(unique(unlist(apply(matrix(x[permutations(numberterms)],ncol=numberterms),1, paste,collapse=":"))))
}
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