Node: The Node class
In felixlindemann/HNUORTools: Operations Research Tools

Description Details Slots Creating objects of type Node Methods Derived Classes To be used for Note Author(s) See Also Examples

This class is part of the HNUORTools. It represents the base class for every locateable class in an Operations-Research (OR)-context.

Find here the defined slots for this class.

id:: Object of class "character", containing data from id. Should be unique. The default value will be caluclated randomly.
label:: Object of class "character", containing the label of the Node. The default value will be caluclated randomly.
x:: Object of class "numeric", containing the x-coordinate of the Node. The default value will be caluclated randomly.
y:: Object of class "numeric", containing the y-coordinate of the Node. The default value will be caluclated randomly.

Creating objects of type `Node`

Creating an S4-Object: new("Node", ...)
Converting from a data.frame: as.Node{<data.frame>} See also below in the Methods-Section.
Converting from a list: as.Node{<list>} See also below in the Methods-Section.

as.list(node, ...): Converts a Node into a list. ... are user-defined (not used) parameters.
as.data.frame(node, ...): Converts a Node into a data.frame. as.data.frame accepts the optional parameter withrownames of class "logical" (default is TRUE). If withrownames == TRUE the returned data.frame will recieve the id as rowname. ... are user-defined (not used) parameters.
as.Node(obj): Converts an object of class data.frame or of class list into a Node.
is.Node(obj): Checks if the object obj is of type Node.
getDistance: Calculating the distance between two Nodes (As the classes Customer and Warehouse depend on Node, distances can be calculated between any of these objects).
getpolar: Calculating the polar-angle to the x-Axis of a link, connecting two Nodes (As the classes Customer and Warehouse depend on Node, polar-angles can be calculated between any of these objects).

Customer: This class extends the Node-Class with attributes for according to customers for OR-Problems.
Warehouse: This class extends the Node-Class with attributes for according to warehouses for OR-Problems.
Link: This class is constructed by two entities of the Node-Class representing the origin and destination of Link for OR-Problems.

SPP: Shortest-Path-Problem
TSP: Travelling Salesman Problem

for citing use: Felix Lindemann (2014). HNUORTools: Operations Research Tools. R package version 1.1-0. http://felixlindemann.github.io/HNUORTools/.

Dipl. Kfm. Felix Lindemann felix.lindemann@hs-neu-ulm.de

Wissenschaftlicher Mitarbeiter Kompetenzzentrum Logistik Buro ZWEI, 17

Hochschule fur angewandte Wissenschaften Fachhochschule Neu-Ulm | Neu-Ulm University Wileystr. 1

D-89231 Neu-Ulm

Phone +49(0)731-9762-1437 Web www.hs-neu-ulm.de/felix-lindemann/ http://felixlindemann.blogspot.de

The classes are derived from this class and the following Methods can be used with this class.:

# create a new Node with specific values
x<- new("Node", x= 10, y=20, id="myid", label = "mylabel")
x
# create from data.frame
df<- data.frame(x=10,y=20)
new("Node", df)
as(df, "Node")
as.Node(df)
#create some nodes
n1 <- new("Node",x=10,y=20, id ="n1")
n2 <- new("Node",x=13,y=24, id ="n1")
# calculate Beeline distance
#getDistance(n1,n2) # should result 5
#getDistance(n1,n2, costs = 2) # should result 10