This function retrieves the child node ids of a given node from an adjacency list of a tree.
The adjacency list of the tree.
The node whose children should be extracted.
Remember that the list has to be for a tree, not a general graph. Please see other help pages for more specifications.
This is a low-level function, used within the S4 class TreeHarp. It is not generally meant for use by the user.
A vector of integers specifying the children of that particular node. If the node is a leaf, it returns NULL.