Identify Relocations Fullfilling a Condition in an Object of Class "ltraj"
This function identifies the relocations fullfilling a condition in an
object of class ltraj.
which.ltraj(ltraj, expr)
ltraj |
an object of class |
expr |
a character string giving any syntactically correct R
logical expression implying the descriptive elements in
|
A data frame giving the ID, the Bursts and the relocations for which
the condition described by expr is verified.
Clement Calenge clement.calenge@ofb.gouv.fr
ltraj for additional information about objects
of class ltraj
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),]
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