turtles backward of their headings' directions.
bk(turtles, dist, world, torus = FALSE, out = TRUE) # S4 method for agentMatrix,numeric bk(turtles, dist, world, torus = FALSE, out = TRUE)
AgentMatrix object representing the moving
Numeric. Vector of distances to move. Must
be of length 1 or of length
Logical to determine if the
world is wrapped. Default is
torus = FALSE.
Logical. Determine if a
turtle should move when
torus = FALSE and its ending position will be outside of
world's extent. Default is
out = TRUE.
AgentMatrix representing the
turtles with updated
coordinates and updated data for their previous coordinates
torus = FALSE and
out = TRUE,
does not need to be provided.
If a distance to move leads a `turtle` outside of the `world`'s extent and `torus = TRUE`, the `turtle` is relocated on the other side of the `world`, inside its extent; if `torus = FALSE` and `out = TRUE`, the `turtle` moves past the `world`'s extent; if `torus = FALSE` and `out = FALSE`, the `turtle` does not move at all. In the event that a `turtle` does not move, its previous coordinates are still updated with its position before running `bk()` (i.e., its current position). If a given `dist` value is negative, then the `turtle` moves forward. The `turtles`' headings are not affected by the function (i.e., the `turtles` do not face backward).
Wilensky, U. 1999. NetLogo. http://ccl.northwestern.edu/netlogo/. Center for Connected Learning and Computer-Based Modeling, Northwestern University. Evanston, IL.
w1 <- createWorld( minPxcor = 0, maxPxcor = 4, minPycor = 0, maxPycor = 4, data = runif(25) ) t1 <- createOTurtles(n = 10, world = w1) plot(w1) points(t1, col = of(agents = t1, var = "color"), pch = 16) t1 <- fd(turtles = t1, dist = 2) points(t1, col = of(agents = t1, var = "color"), pch = 16) t1 <- bk(turtles = t1, dist = 1) points(t1, col = of(agents = t1, var = "color"), pch = 16) t1 <- fd(turtles = t1, dist = 0.5) points(t1, col = of(agents = t1, var = "color"), pch = 16)