Published April 10, 2012 in α – Shape generation with R | Full size is 672 × 672 pixels

Example data set for alpha shapes

Example data set for alpha shapes

Dataset generated to play with alpha shapes

# Uniform sample of size n=300 in the annulus B(c, 0.5)\B(c, 0.25) 
# with c=(0.5, 0.5). 
n <- 300
theta<-runif(n,0,2*pi)
r<-sqrt(runif(n,0.25^2,0.5^2))
x<-cbind(0.5+r*cos(theta),0.5+r*sin(theta))
plot(x)

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