drop_nodes deletes
one or more nodes from an existing FFT definition
(by removing the corresponding rows from the FFT definition
in the tidy data frame format).
When dropping the final node, the last remaining node becomes the new final node (i.e., gains a second exit).
Duplicates in nodes are dropped only once
(rather than incrementally) and nodes not in
the range 1:nrow(fft) are ignored.
Dropping all nodes yields an error.
drop_nodes is the inverse function of select_nodes.
Inserting new nodes is possible by add_nodes.
See also
add_nodes for adding nodes to an FFT definition;
edit_nodes for editing nodes in an FFT definition;
select_nodes for selecting nodes in an FFT definition;
get_fft_df for getting the FFT definitions of an FFTrees object;
read_fft_df for reading one FFT definition from tree definitions;
add_fft_df for adding FFTs to tree definitions;
FFTrees for creating FFTs from and applying them to data.
Other tree definition and manipulation functions:
add_fft_df(),
add_nodes(),
edit_nodes(),
flip_exits(),
get_fft_df(),
read_fft_df(),
reorder_nodes(),
select_nodes(),
write_fft_df()