PlotGraph2D {DataVisualizations}

PlotGraph2D

Description

plots a neighborhood graph in two dimensions given the 2D coordinates of the points

Usage

PlotGraph2D(AdjacencyMatrix, Points, Cls, Colors, xlab = "X", ylab = "Y", xlim,
ylim, Plotter = "native", LineColor = "grey", pch = 20, lwd = 0.1, main = "",
mainSize)

Arguments

AdjacencyMatrix

[1:n,1:n] numerical matrix consting of binary values. 1 indicates that two points have an edge, zero that they do not

Points

[1:n,1:2] numeric matrix of two feature

Cls

[1:n] numeric vector of k classes, if not set per default every point is in first class

Colors

Optional, string defining the k colors, one per class

xlab

Optional, string for xlabel

ylab

Optional, string for ylabel

xlim

Optional, [1:2] vector of x-axis limits

ylim

Optional, [1:2] vector of y-axis limits

Plotter

Optional, either "native" or "plotly"

LineColor

Optional, color of edges

pch

Optional, shape of point, usally can be in a range from zero to 25, see pch of plot for details

lwd

width of the lines

main

Optional, string for the title of plot

mainSize

Optional, scalar for the size of the title of plot

Details

The points are the vertices of the graph. the adjacency matrix defines the edges. Via adjacency matrix various graphs, like from deldir package, can be used.

Value

native plot or plotly object depending on input argument Plotter

Author(s)

Michael Thrun

References

Lecture of Knowledge Discovery II

See Also

pch

Examples

N=10
x=runif(N)
y=runif(N)
Euklid=as.matrix(dist(cbind(x,y)))
Radius=quantile(as.vector(Euklid),0.5)
RKugelGraphAdjMatrix = matrix(0, ncol = N, nrow = N)
for (i in 1:N) {
  RInd = which(Euklid[i, ] <= Radius, arr.ind = TRUE)
  RKugelGraphAdjMatrix[i, RInd] = 1
}
PlotGraph2D(RKugelGraphAdjMatrix,cbind(x,y))