spMC (version 0.3.15)

which_lines: Points Classification through Directional Lines

Description

The function classifies points which appertain to a same directional line.

Usage

which_lines(coords, direction, tolerance = pi / 8)

Value

A numerical vector containing the line number for each point.

Arguments

coords

an $n\times d$ matrix where each row denotes the $d$-D coordinates of data locations.

direction

a $d$-D numerical vector (or versor) which represents the chosen direction.

tolerance

a numerical value for the tolerance angle (in radians). It's pi/8 by default.

Author

Luca Sartore

Details

The algorithm used by this function searches the nearest points to a directional line. The function classifies such pairs of points that have the minimum distance and the same direction of the vector $\varphi$.

This operation is done to order points, so that it's possible to compute mean lengths (mlen) and embedded transition probabilities (embed_MC).

References

Sartore, L. (2010) Geostatistical models for 3-D data. M.Phil. thesis, Ca' Foscari University of Venice.

See Also

embed_MC, mlen, getlen

Examples

# \donttest{
data(ACM)

direction <- c(0,0,1)

loc.id <- which_lines(ACM[, 1:3], direction)# }