TrajScale: Scale a trajectory

In JimMcL/trajr: Animal Trajectory Analysis

Scale a trajectory

Description

Scales the cartesian coordinates in a trajectory, for example, to convert units from pixels to metres.

Usage

TrajScale(trj, scale, units, yScale = scale)

Arguments

trj	The trajectory to be scaled.
scale	Scaling factor to be applied to the trajectory coordinates.
units	Character specifying the spatial units after scaling, e.g. "m" or "metres"
yScale	Optional scaling factor to be applied to the y-axis, which may be specified if the original coordinates are not square. Defaults to scale.

Value

new scaled trajectory.

Examples

set.seed(42)
trj <- TrajGenerate()
# original trajectory units are pixels, measured as having
# 47 pixels in 10 mm, so to convert to metres, scale the
# trajectory by the approriate factor, i.e. (size in metres) / (size in pixels).
scale <- .01 / 47
scaled <- TrajScale(trj, scale, "m")

JimMcL/trajr documentation built on Jan. 31, 2024, 12:57 a.m.