# speed: Get statistics about speed In moveBB: Analysis of Trajectory Data using Linear or Brownian Motion Model

## Description

Get speed over any time intervals in the linear model. Get density, distribution function, quantiles and expected value in BBMM.

## Usage

 ```1 2 3 4 5 6``` ```speed(tr, time, time.scale = NA) mu.speed(tr, time, time.scale=NA) pspeed(v, tr, time, time.scale=NA) dspeed(v, tr, time, time.scale=NA) qspeed(p, tr, time, time.scale=NA) ```

## Arguments

 `v` Vector of speeds `p` Vector of probabilities `tr` The trajectory object `time` Vector of times `time.scale` The length of the intervals over which to report the speed or direction

## Details

The speed at a time t is defined as the absolute value of the `velocity` over the time interval [t-time.scale/2, t+time.scale/2].

## Value

`speed` and `mu.speed` return a matrix indexed by the ID in the trajectory and time. `dspeed`, `pspeed` and `qspeed` return an array indexed by ID, the requested speed or probability and time.

`velocity`, `bbtraj`
 ```1 2 3 4 5 6 7 8``` ```data("vervet_monkeys", package="moveBB") ## Compute the (linear model) speed over two half-hour intervals #v <- speed(monkey.tr, as.POSIXct(c("2011-01-18 15:15:15", "2011-01-19 16:30:00")), 1800) #v ## Compute the density of four speeds over the same time intervals #dspeed(v, monkey.tr, as.POSIXct(c("2011-01-18 15:15:15", "2011-01-19 16:30:00")), 1800) ```