extract.partitionsNumber extracts the number of partitions for a
given sub-tree, either marked or non-marked.
Arguments
- x
- an object of class - partitionsNumber, result of function- partitionsNumber.
- node
- the root node of the subtree where to get the result. Default to the root of the tree. 
- npart
- the number of partitions (colors) allowed at the tips. Default to the value used in the call of function - partitionsNumber(the maximum).
- marked
- whether to extract the marked (TRUE) or un-marked (FALSE) partitions. The number of models is the number of un-marked partitions. Default to FALSE. 
- ...
- unused.