SinglePointCalc {SimilarityMeasures}

Calculate Frechet Distance With a Single Point Trajectory

Description

A function to calculate the Frechet distance between two trajectories. This function is called by the frechet function when one trajectory consists of a single point. This function does not need to be directly called.

Usage

SinglePointCalc(traj1, traj2)

Arguments

traj1

An m x n matrix containing trajectory1. Here m is the number of points and n is the dimension of the points.

traj2

A k x n matrix containing trajectory2. Here k is the number of points and n is the dimension of the points. The two trajectories are not required to have the same number of points.

Details

This calculates the longest distance to the single point trajectory. This is the Frechet distance for such a pair of trajectories. This function is automatically called if required by the Frechet function, therefore it does not need to be called directly.

Value

A floating point value representing the Frechet distance is returned.

Author(s)

Kevin Toohey

See Also

Frechet

Examples

# Creating two trajectories.
path1 <- matrix(c(0, 1), 1)
path2 <- matrix(c(0, 1, 2, 3, 4, 5, 6, 7), 4)

# Running the Frechet distance algorithm which will
# automatically call this function.
Frechet(path1, path2)