[character(1)]
Character string containing path to file in TSPLIB format.
pattern
[character(1)]
Pattern of files under path that are considered as instances.
max_size
[numeric(1)]
Upper bound for instance size (i.e. number of cities). Only applicable,
if instance size is contained in file name. Default value ist 1000.
use_names
[logical(1)]
Use base names of files as names of instances in returned list.
on_no_coords
[character(1)]
How to handle instances which do not have any
coordinates. Possible values are, “stop” and “warn”
which either stop or raise a warning respectivly.