num.arcsPEint: Number of arcs of Proportional Edge Proximity Catch Digraphs...

In pcds: Proximity Catch Digraphs and Their Applications

Number of arcs of Proportional Edge Proximity Catch Digraphs (PE-PCDs) and quantities related to the interval - one interval case

Description

An object of class "NumArcs". Returns the number of arcs of Proportional Edge Proximity Catch Digraph (PE-PCD) whose vertices are the data points in Xp in the one middle interval case. It also provides number of vertices (i.e., number of data points inside the intervals) and indices of the data points that reside in the intervals.

The data points could be inside or outside the interval is int=(a,b). PE proximity region is constructed with an expansion parameter r \ge 1 and a centrality parameter c \in (0,1). int determines the end points of the interval.

The PE proximity region is constructed for both points inside and outside the interval, hence the arcs may exist for all points inside or outside the interval.

See also (\insertCiteceyhan:metrika-2012;textualpcds).

Usage

num.arcsPEint(Xp, int, r, c = 0.5)

Arguments

Xp	A set of 1D points which constitute the vertices of PE-PCD.
int	A vector of two real numbers representing an interval.
r	A positive real number which serves as the expansion parameter in PE proximity region; must be \ge 1.
c	A positive real number in (0,1) parameterizing the center inside int=(a,b) with the default c=.5. For the interval, int=(a,b), the parameterized center is M_c=a+c(b-a).

Value

A list with the elements

desc	A short description of the output: number of arcs and quantities related to the interval
num.arcs	Total number of arcs in all intervals (including the end-intervals), i.e., the number of arcs for the entire PE-PCD
num.in.range	Number of Xp points in the interval int
num.in.ints	The vector of number of Xp points in the partition intervals (including the end-intervals)
int.num.arcs	The vector of the number of arcs of the components of the PE-PCD in the partition intervals (including the end-intervals)
data.int.ind	A vector of indices of partition intervals in which data points reside. Partition intervals are numbered from left to right with 1 being the left end-interval.
ind.left.end, ind.mid, ind.right.end	Indices of data points in the left end-interval, middle interval, and right end-interval (respectively)
tess.points	Tessellation points, i.e., points on which the tessellation of the study region is performed, here, tessellation points are the end points of the support interval int.
vertices	Vertices of the digraph, Xp.

Author(s)

Elvan Ceyhan

References

\insertAllCited

See Also

num.arcsPEmid.int, num.arcsPEend.int, and num.arcsCSint

Examples

c<-.4
r<-2
a<-0; b<-10; int<-c(a,b)

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

set.seed(123)

n<-10
Xp<-runif(n,a-xf,b+xf)
Narcs = num.arcsPEint(Xp,int,r,c)
Narcs
summary(Narcs)
plot(Narcs)

pcds documentation built on May 29, 2024, 9:36 a.m.