arcsPEend.int {pcds}

The arcs of Proportional Edge Proximity Catch Digraph (PE-PCD) for 1D data - end-interval case

Description

An object of class "PCDs". Returns arcs of PE-PCD as tails (or sources) and heads (or arrow ends) and related parameters and the quantities of the digraph. The vertices of the PE-PCD are the 1D data points in Xp in the end-interval case. Yp determines the end points of the end-intervals.

For this function, PE proximity regions are constructed data points outside the intervals based on Yp points with expansion parameter r \ge 1. That is, for this function, arcs may exist for points only inside end-intervals. It also provides various descriptions and quantities about the arcs of the PE-PCD such as number of arcs, arc density, etc.

See also (Ceyhan (2012)).

Usage

arcsPEend.int(Xp, Yp, r)

Arguments

Xp

A set or vector of 1D points which constitute the vertices of the PE-PCD.

Yp

A set or vector of 1D points which constitute the end points of the intervals.

r

A positive real number which serves as the expansion parameter in PE proximity region; must be \ge 1.

Value

A list with the elements

type

A description of the type of the digraph

parameters

Parameters of the digraph, here, it is the expansion parameter.

tess.points

Tessellation points, i.e., points on which the tessellation of the study region is performed, here, tessellation is the intervalization based on Yp.

tess.name

Name of the tessellation points tess.points

vertices

Vertices of the digraph, Xp points

vert.name

Name of the data set which constitutes the vertices of the digraph

S

Tails (or sources) of the arcs of PE-PCD for 1D data in the end-intervals

E

Heads (or arrow ends) of the arcs of PE-PCD for 1D data in the end-intervals

mtitle

Text for "main" title in the plot of the digraph

quant

Various quantities for the digraph: number of vertices, number of partition points, number of intervals (which is 2 for end-intervals), number of arcs, and arc density.

Author(s)

Elvan Ceyhan

References

Ceyhan E (2012). “The Distribution of the Relative Arc Density of a Family of Interval Catch Digraph Based on Uniform Data.” Metrika, 75(6), 761-793.

See Also

arcsPEmid.int, arcsPE1D , arcsCSmid.int, arcsCSend.int and arcsCS1D

Examples

r<-2
a<-0; b<-10; int<-c(a,b);

#nx is number of X points (target) and ny is number of Y points (nontarget)
nx<-15; ny<-4;  #try also nx<-40; ny<-10 or nx<-1000; ny<-10;

set.seed(1)
xf<-(int[2]-int[1])*.5

Xp<-runif(nx,a-xf,b+xf)
Yp<-runif(ny,a,b)  #try also Yp<-runif(ny,a,b)+c(-10,10)

Arcs<-arcsPEend.int(Xp,Yp,r)
Arcs
summary(Arcs)
plot(Arcs)

S<-Arcs$S
E<-Arcs$E

jit<-.1
yjit<-runif(nx,-jit,jit)

Xlim<-range(a,b,Xp,Yp)
xd<-Xlim[2]-Xlim[1]

plot(cbind(a,0),pch=".",
main="arcs of PE-PCDs for points (jittered along y-axis)\n in end-intervals ",
xlab=" ", ylab=" ", xlim=Xlim+xd*c(-.05,.05),ylim=3*c(-jit,jit))
abline(h=0,lty=1)
points(Xp, yjit,pch=".",cex=3)
abline(v=Yp,lty=2)
arrows(S, yjit, E, yjit, length = .05, col= 4)