speed
measures the speed between successive relocations of
animals, using objects of class traj
.
1 2 |
x |
an object of class |
id |
a character vector giving the identity of the animals for which the speed is to be computed |
burst |
a character vector giving the identity of the circuits
for which the speed is to be computed (see |
date |
a vector of class |
units |
a character string. It determines how the
speeds are computed. For example, if the coordinates are given in
meters, and if |
Returns a data frame with the following components:
id |
the identity of the animal |
x |
if the speed is computed between the relocation 1 and 2, the x coordinate of the relocation 1. |
y |
if the speed is computed between the relocation 1 and 2, the y coordinate of the relocation 1. |
date |
a vector of class |
burst |
the identity of the circuit |
sp.x |
the computed speed of the animal in the x direction |
sp.y |
the computed speed of the animal in the y direction |
speed |
the computed speed of the animal on the plane. |
dt |
the duration between the two relocations (in the units given
by the parameter |
The function speed
is deprecated. The class ltraj
computes the speeds automatically (see ltraj
).
Clement Calenge clement.calenge@oncfs.gouv.fr
traj
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