TSP (version 1.2-4)

TSP: Class TSP -- Symmetric traveling salesperson problem

Description

Constructor to create an instance of a symmetric traveling salesperson problem (TSP) and some auxiliary methods.

Usage

TSP(x, labels = NULL, method = NULL)
as.TSP(x)
# S3 method for dist
as.TSP(x)
# S3 method for matrix
as.TSP(x)
# S3 method for TSP
as.dist(m, ...)
# S3 method for TSP
print(x, ...)
n_of_cities(x)
# S3 method for TSP
n_of_cities(x)
# S3 method for TSP
labels(object, ...)
# S3 method for TSP
image(x, order, col = gray.colors(64), ...)

Value

• TSP() returns x as an object of class TSP.

• n_of_cities() returns the number of cities in x.

• labels() returns a vector with the names of the cities in x.

Arguments

x, object

an object (currently dist or a symmetric matrix) to be converted into a TSP or, for the methods, an object of class TSP.

labels

optional city labels. If not given, labels are taken from x.

method

optional name of the distance metric. If x is a dist object, then the method is taken from that object.

m

a TSP object to be converted to a dist object.

...

further arguments are passed on.

order

order of cities for the image as an integer vector or an object of class TOUR.

col

color scheme for image.

Author

Michael Hahsler

Details

Objects of class TSP are internally represented as dist objects (use as.dist() to get the dist object).

Not permissible paths can be set to a distance of +Inf. NAs are not allowed and -Inf will lead to the algorithm only being able to find an admissible tour, but not the best one.

See Also

Other TSP: ATSP(), Concorde, ETSP(), TSPLIB, insert_dummy(), reformulate_ATSP_as_TSP(), solve_TSP()

Examples

data("iris")
d <- dist(iris[-5])

## create a TSP
tsp <- TSP(d)
tsp

## use some methods
n_of_cities(tsp)
labels(tsp)
image(tsp)