filterTSPInstances: Filter TSPlib instances according to its specifications.
In netgen: Network Generator for Combinatorial Graph Problems

Description Usage Arguments Value See Also Examples

Given a directory of TSP problems in the TSPlib format with file extension .tsp, this function reads the specifications of each TSPlib instance in that directory and returns a data frame with rowwise information about each instance.

Basically the function is a wrapper around getTSPInstancesOverview.

1 2	filterTSPInstances(directory = NULL, expr, paths.only = FALSE, opt.known = FALSE)

`directory`	[`character(1)`] Readable directory path.
`expr`	[`expression`] Expression wrapped with the `quote` function.
`paths.only`	[`logical(1)`] Should only the full file names of the instances be returned? Default is `FALSE`.
`opt.known`	[`logical(1)`] Filter instances x with unknown optimal tour length (given in file x.tsp.tour)? Default is `FALSE`.

[data.frame]

getTSPInstancesOverview

## Not run: 
# Get a data frame of instances and its properties for all instances
# with more than 4000 nodes
filterTSPInstances("path/to/instances", quote(dimension > 4000))

# Now get only the full file names of all instances with edge weight type
# EUC_2D or CEIL_2D (see tsplib documentation for details)
filterTSPInstances("path/to/instances",
  expr = quote(edge_weight_type %in% c("EUC_2D", "CEIL_2D")),
  paths.only = TRUE
)

## End(Not run)