mutate_tr: Conveniently add common new variables to the 'tr' table.

In Ax3man/trackr: Analyze and Visualize Tracking Data

Description

These functions are designed for use within summarise_, and will compute common derived parameters for tracks. By default, these functions will use the expected variable names, as are default in tracks objects, but they can be overridden.

Usage

change(var, order_by = frame, frame_rate = tracks$params$frame_rate,
  n = 1)

speed(x = X, y = Y, order_by = frame,
  frame_rate = tracks$params$frame_rate)

acceleration(x = X, y = Y, order_by = frame,
  frame_rate = tracks$params$frame_rate)

heading(x = X, y = Y, order_by = frame)

angular_velocity(x = X, y = Y, order_by = frame,
  frame_rate = tracks$params$frame_rate)

Arguments

var	A variable for which to calculate the first order differential.
order_by	This parameter controls the ordering of dplyr::lag and dplyr::lead and it is strongly advised to leave it at it's default (frame).
frame_rate	All variables with a time dimension, will be calculated based on seconds (not frames). By default this is read from the tracks object.
n	Offset for change. See lag.
x	X-coordinate.
y	Y-coordinate.

See Also

mutate_soc mutate_.tracks

Ax3man/trackr documentation built on Oct. 8, 2019, 10:53 p.m.