Nothing
co_table <- function(x, margin, collapse = ".")
{
if (!is.array(x))
stop("x is not an array")
if("xtabs" %in% class(x)) attr(x, "call") <- NULL
dx <- dim(x)
idx <- lapply(dx, function(i) 1:i)
dn <- dimnames(x)
if(is.character(margin)) {
if(is.null(dn)) stop("margin must be an index when no dimnames are given")
margin <- which(names(dn) %in% margin)
}
idxm <- expand.grid(idx[margin])
cotab1 <- function(i) {
idx[margin] <- lapply(1:length(margin), function(j) idxm[i,j])
rval <- as.table(do.call("[", c(list(x), idx, list(drop = FALSE))))
if(length(dim(rval)) > 1) {
dim(rval) <- dim(x)[-margin]
dimnames(rval) <- dimnames(x)[-margin]
}
return(rval)
}
rval <- lapply(1:NROW(idxm), cotab1)
if(!is.null(dn)) names(rval) <- apply(expand.grid(dn[margin]), 1, function(z) paste(z, collapse = collapse))
return(rval)
}
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