Determine the Depth / Level of Nesting of a List
ldepth provides the depth of a list or list-like structure.
TRUEtreats data frames like (sub-)lists;
FALSElike atomic elements.
The depth or level or nesting of a list or list-like structure (e.g. a model object) is found by recursing down to the bottom of the list and adding an integer count of 1 for each level passed. For example the depth of a data frame is 1. If a data frame has list-columns, the depth is 2. However for reasons of efficiency, if
l is not a data frame and
DF.as.list = FALSE, data frames found inside
l will not be checked for list column's but assumed to have a depth of 1.