Nothing

```
#######################################################################
# TSP - Traveling Salesperson Problem
# Copyrigth (C) 2011 Michael Hahsler and Kurt Hornik
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
## heuristic to improve a tour using exchanges of 2 edges.
tsp_two_opt <- function(x, control = NULL){
control <- .get_parameters(control, list(
tour = NULL,
rep = 1
))
## improve a given tour or create a random tour
## we use a function since for rep >1 we want several random
## initial tours
initial <- function() {
if(!is.null(control$tour)) as.integer(control$tour)
else sample(n_of_cities(x))
}
xx <- as.matrix(x)
if(control$rep > 1) {
tour <- replicate(control$rep, .Call(R_two_opt, xx, initial()), simplify = FALSE)
lengths <- sapply(tour, FUN = function(t) tour_length(x, t))
tour <- tour[[which.min(lengths)]]
}else tour <- .Call(R_two_opt, xx, initial())
tour
}
```

**Any scripts or data that you put into this service are public.**

Embedding an R snippet on your website

Add the following code to your website.

For more information on customizing the embed code, read Embedding Snippets.