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Trajectory Analysis in R
An R package for analysing animal trajectories, which represent the movements of animals through space and time. It provides functions to easily calculate various quantitative measures of trajectories such as speed and straightness or tortuosity. It also provides a range of other trajectory operations such as resampling to fixed step lengths (rediscretization), determining turning angles and step lengths, and so on. While mainly focussed on 2-dimensional trajectories,trajr does have some functionality for analysing 3-dimensional trajectories. If you usetrajr in your research, please citeMcLean, D. J., & Skowron Volponi, M. A. (2018). trajr: An R package for characterisation of animal trajectories. Ethology, 124(6), 440-448. https://doi.org/10.1111/eth.12739.
trajr does not provide functionality to create trajectories; it operates on existing trajectories that are sequences of(x, y, time) coordinates. It does, however, provide some functionality to generate random or constrained trajectories for simulations or for testing of analyses.
Refer toNEWS.md for a list of changes in each version. The articletrajr: An R package for characterisation of animal trajectories describedtrajr version 1.0.0. Please refer toNEWS.md for a brief summary of what has changed since the article was written.
$ install.packages("trajr")Or to install the latest development version directly from Github:
$ install.packages("devtools")$ devtools::install_github("JimMcL/trajr")Or else, to install from Githuband get the user documentation (vignette):
$ install.packages("devtools")$ devtools::install_github("JimMcL/trajr", build_vignettes = TRUE)Unfortunately, installing vignettes can be time-consuming.
The best way to start is to readour paper and the package vignette. After installation from CRAN (or from github including vignettes), the vignette can be accessed by runningbrowseVignettes(package = "trajr"). The vignette for the CRAN version is available on CRAN athttps://cran.r-project.org/web/packages/trajr/vignettes/trajr-vignette.html.
A vignette demonstrating trajectory simulation is available online athttps://cran.r-project.org/web/packages/trajr/vignettes/simulations.html.
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Trajectory Analysis in R
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