logSpeed {crawl}R Documentation

calculate estimate of log speed from a crwPredict object

Description

Calculates log speed estimates and standard errors based on the delta method. Typically this is used within the function crwPredict.

Usage


logSpeed(predx, predy, varx, vary, polar.coord)

Arguments

predx matrix of longitude state estimates.
predy matrix of latitude state estimates.
varx an array of covariance matrices for predx.
vary ana array of covariance matrices for predy.
polar.coord Logical. TRUE if coordinates are polar.

Value

data.frame with colums:

ln.speed log speed estimate (in meters/time unit if polar.coord=TRUE.
var.ln.speed log speed estimated standard error.

Author(s)

Devin S. Johnson


[Package crawl version 1.0-3 Index]