Description Usage Arguments Details Value Author(s) References See Also

Wrapper for selecting different animal movement methods.

This version uses just turn angles and step lengths to define the correlated random walk.

1 2 3 4 5 6 7 8 9 10 11 | ```
move(hypothesis = "crw", ...)
crw(agent, extent, stepLength, stddev, lonlat, torus = FALSE)
## S4 method for signature 'SpatialPointsDataFrame'
crw(agent, extent, stepLength, stddev,
lonlat, torus = FALSE)
## S4 method for signature 'SpatialPoints'
crw(agent, extent, stepLength, stddev, lonlat,
torus = FALSE)
``` |

`hypothesis` |
Character vector, length one, indicating which movement
hypothesis/method to test/use. Currently defaults to
'crw' (correlated random walk) using |

`...` |
arguments passed to the function in |

`agent` |
A |

`extent` |
An optional |

`stepLength` |
Numeric vector of length 1 or number of agents describing step length. |

`stddev` |
Numeric vector of length 1 or number of agents describing standard deviation of wrapped normal turn angles. |

`lonlat` |
Logical. If |

`torus` |
Logical. Should the movement be wrapped to the opposite
side of the map, as determined by the |

This simple version of a correlated random walk is largely the version that was presented in Turchin 1998, but it was also used with bias modifications in McIntire, Schultz, Crone 2007.

A SpatialPointsDataFrame object with updated spatial position defined by a single occurrence of step length(s) and turn angle(s).

Eliot McIntire

Eliot McIntire

Turchin, P. 1998. Quantitative analysis of movement: measuring and modeling population redistribution in animals and plants. Sinauer Associates, Sunderland, MA.

McIntire, E. J. B., C. B. Schultz, and E. E. Crone. 2007. Designing a network for butterfly habitat restoration: where individuals, populations and landscapes interact. Journal of Applied Ecology 44:725-736.

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