Helper function that deduces (likely to be a reminder)
partition scheme from $slidings of Ldk objects.
Value
a list with two components: n the number of partition; id
their position. Or a NULL if no slidings are defined
See also
Other ldk/slidings methods:
add_ldk(),
def_ldk(),
def_slidings(),
get_ldk(),
get_slidings(),
rearrange_ldk()