This function is intended for use when writing custom splitting logic. In cases where the split is associated with
a single variable, the name of that variable will be returned. At time of writing this includes splits generated
via the split_rows_by(), split_cols_by(), split_rows_by_cuts(), split_cols_by_cuts(),
split_rows_by_cutfun(), and split_cols_by_cutfun() layout directives.
spl_variable(spl)# S4 method for VarLevelSplit
spl_variable(spl)
# S4 method for VarDynCutSplit
spl_variable(spl)
# S4 method for VarStaticCutSplit
spl_variable(spl)
# S4 method for Split
spl_variable(spl)
For splits with a single variable associated with them, returns the split. Otherwise, an error is raised.
(VarLevelSplit)
the split object.
make_split_fun