Nothing
set_symdiff <-
function(...)
{
len <- length(l <- list(...))
SD <- function(x, y) set_union(set_complement(x, y), set_complement(y, x))
if (len < 1L)
gset()
else if (len < 2L)
l[[1L]]
else
Reduce(SD, l)
}
gset_symdiff <-
function(...)
{
len <- length(l <- list(...))
SD <- function(x, y) gset_union(gset_complement(x, y), gset_complement(y, x))
if (len < 1L)
gset()
else if (len < 2L)
l[[1L]]
else
Reduce(SD, l)
}
cset_symdiff <-
function(...)
{
len <- length(l <- list(...))
SD <- function(x, y) cset_union(cset_complement(x, y), cset_complement(y, x))
if (len < 1L)
set()
else if (len < 2L)
l[[1L]]
else
Reduce(SD, l)
}
"%D%" <-
function(x, y)
{
if (!is.cset(x)) x <- as.cset(x)
if (!is.cset(y)) y <- as.cset(y)
if (is.set(x) && is.set(y))
set_symdiff(x, y)
else if (is.gset(x) && is.gset(y))
gset_symdiff(x, y)
else if (is.cset(x) && is.cset(y))
cset_symdiff(x, y)
else
stop("Operator only defined for (g,c)sets.")
}
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