GetVT | R Documentation |

The VT table computes speeds, step lengths, orientations, turning angles and
ancillary variables from a track. The output of this function is (typically)
meant to feed the `WindowSweep`

function.

GetVT(Data, units = "hour", skiplast = TRUE)

`Data` |
a track to analyze. Must contain columns: X, Y and Time (as a
POSIX object). The |

`units` |
the time units for the analysis; one of |

`skiplast` |
filters away last step. |

a data frame with the following columns:

`Z.start, Z.end` |
the start and end locations (as complex coordinates) |

`S` |
the step length |

`Phi, Theta` |
absolute and turning angle, respectively |

`T.start, T.end` |
start and time of steps (numeric - in given units) |

`T.mid` |
temporal midpoint of the step |

`dT` |
duration of the step |

`V` |
approximate speed (S/dT) |

`T.POSIX` |
the temporal midpoint of the step as a POSIX objects. |

Eliezer Gurarie

`WindowSweep`

data(Simp) plot(Simp) Simp.VT <- GetVT(Simp) head(Simp.VT) # Distribution of estimated speeds hist(Simp.VT$V, col="grey", breaks=20) # Distribution of turning angles if (requireNamespace("circular", quietly = TRUE)) circular::rose.diag(Simp.VT$Theta, bins=24) else hist(Simp.VT$Theta)

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