TSP: Class TSP - Symmetric traveling salesperson problem

In TSP: Traveling Salesperson Problem (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 class 'dist'
as.TSP(x)

## S3 method for class 'matrix'
as.TSP(x)

## S3 method for class 'TSP'
as.dist(m, ...)

## S3 method for class 'TSP'
print(x, ...)

n_of_cities(x)

## S3 method for class 'TSP'
n_of_cities(x)

## S3 method for class 'TSP'
labels(object, ...)

## S3 method for class 'TSP'
image(x, order, col = gray.colors(64), ...)

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.

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.

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.

Author(s)

Michael Hahsler

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)

TSP documentation built on April 4, 2023, 5:13 p.m.