PlotGraph2D function

PlotGraph2D

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

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.

Returns

native plot or plotly object depending on input argument Plotter

References

Lecture of Knowledge Discovery II

Author(s)

Michael Thrun

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))