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#' subtract
#'
#' Subtract a subtree from a large tree
#'
#' @param x a lineage_tree object
#' @param y a lineage_tree object
#' @param ... additional parameters
#'
#' @return a lineage_tree object
#'
#' @export
#'
setMethod(
'subtract',
signature(
x = 'lineage_tree',
y = 'lineage_tree'
),
function(
x,
y,
...
){
# need to verify if y is a subtree of x
is_leaf <- degree(x@graph, mode = 'out') == 0
leaves_x <- names(x@x[is_leaf])
is_leaf <- degree(y@graph, mode = 'out') == 0
leaves_y <- names(y@x[is_leaf])
stopifnot(all(leaves_y %in% leaves_x))
leaves <- leaves_x[!leaves_x %in% leaves_y]
stopifnot(length(leaves) > 0)
subtree(x, leaves)
}
) # subtree
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