which.ltraj {adehabitatLT}R Documentation

Identify Relocations Fullfilling a Condition in an Object of Class "ltraj"

Description

This function identifies the relocations fullfilling a condition in an object of class ltraj.

Usage

which.ltraj(ltraj, expr)

Arguments

ltraj

an object of class ltraj

expr

a character string giving any syntactically correct R logical expression implying the descriptive elements in ltraj (or the name of a variable in the optional attribute infolocs)

Value

A data frame giving the ID, the Bursts and the relocations for which the condition described by expr is verified.

Author(s)

Clement Calenge clement.calenge@ofb.gouv.fr

See Also

ltraj for additional information about objects of class ltraj

Examples

data(puechcirc)
puechcirc

## Identifies the relocations for which time lag is
## upper than one hour
which.ltraj(puechcirc, "dt>3600")
puechcirc[burst="CH930824"][[1]][27:28,]


## Identifies the speed between successive
## relocations upper than 0.8 meters/second
which.ltraj(puechcirc, "dist/dt > 0.8")

## This is the case for example for the
## relocations #28, 58, 59 and 60 of "CH930824"
puechcirc[burst="CH930824"][[1]][c(28,58,59,60),]


[Package adehabitatLT version 0.3.25 Index]