crawl (version 1.3-2)

logSpeed: 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.

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.