Description Usage Arguments Details Value See Also Examples
View source: R/components_ashape3d.R
This function calculates and clusters the different connected components of the αshape of a given sample of points in the threedimensional space.
1  components_ashape3d(as3d, indexAlpha = 1)

as3d 
An object of class 
indexAlpha 
A single value or vector with the indexes of

The function components_ashape3d
computes the connected components of
the αshape for each value of α in
as3d$alpha[indexAlpha]
when indexAlpha
is numeric.
If indexAlpha="all"
or indexAlpha="ALL"
then the function
computes the connected components of the αshape for all values
of α in as3d$alpha
.
If indexAlpha
is a single value then the function returns a
vector v
of length equal to the sample size. For each sample point
i
, v[i]
represents the label of the connected component to
which the point belongs (for isolated points, v[i]=1
). The labels of
the connected components are ordered by size where the largest one (in
number of vertices) gets the smallest label which is one.
Otherwise components_ashape3d
returns a list of vectors describing
the connected components of the αshape for each selected value
of α.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17  T1 < rtorus(1000, 0.5, 2)
T2 < rtorus(1000, 0.5, 2, ct = c(2, 0, 0), rotx = pi/2)
x < rbind(T1, T2)
alpha < c(0.25, 2)
ashape3d.obj < ashape3d(x, alpha = alpha)
plot(ashape3d.obj, indexAlpha = "all")
# Connected components of the alphashape for both values of alpha
comp < components_ashape3d(ashape3d.obj, indexAlpha = "all")
class(comp)
# Number of components and points in each component for alpha=0.25
table(comp[[1]])
# Number of components and points in each component for alpha=2
table(comp[[2]])
# Plot the connected components for alpha=0.25
plot(ashape3d.obj, byComponents = TRUE, indexAlpha = 1)

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