ETSP

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Class ETSP -- Euclidean traveling salesperson problem

Constructor to create an instance of a Euclidean traveling salesperson problem (TSP) represented by city coordinates and some auxiliary methods.

Keywords
classes
Usage
## constructor ETSP(x, labels = NULL)
## coercion as.ETSP(x)
## methods "n_of_cities"(x) "image"(x, order, col = gray.colors(64), ...) "plot"(x, y = NULL, tour = NULL, tour_lty = 2, tour_col = 1, ...) "labels"(object, ...) "print"(x, ...)
Arguments
x, object
an object (data.frame or matrix) to be converted into a ETSP or, for the methods, an object of class ETSP.
labels
optional city labels. If not given, labels are taken from x.
col
color scheme for image.
order
order of cities for the image as an integer vector or an object of class TOUR.
tour, y
a tour to be visualized.
tour_lty, tour_col
line type and color for tour.
...
further arguments are passed on.
Details

Objects of class ETSP are internally represented as a matrix objects (use as.matrix() to get the matrix object).

Value

ETSP() returns x as an object of class ETSP.n_of_cities() returns the number of cities in x.labels() returns a vector with the names of the cities in x.

See Also

TOUR, insert_dummy, tour_length, solve_TSP.

Aliases
  • ETSP
  • as.ETSP
  • as.ETSP.matrix
  • as.ETSP.data.frame
  • n_of_cities.ETSP
  • print.ETSP
  • labels.ETSP
  • image.ETSP
  • plot.ETSP
Examples
x <- data.frame(x = runif(20), y = runif(20), row.names = LETTERS[1:20])

## create a TSP
etsp <- ETSP(x)
etsp

## use some methods 
n_of_cities(etsp)
labels(etsp)

## plot ETSP and solution
tour <- solve_TSP(etsp)
tour
  
plot(etsp, tour, tour_col = "red")
Documentation reproduced from package TSP, version 1.1-4, License: GPL-3

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