Move the turtles forward with their headings as directions.

fd(turtles, dist, world, torus = FALSE, out = TRUE)

# S4 method for agentMatrix,numeric
fd(turtles, dist, world, torus = FALSE, out = TRUE)



AgentMatrix object representing the moving agents.


Numeric. Vector of distances to move. Must be of length 1 or of length turtles.


WorldMatrix or worldArray object.


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 the world's extent. Default is out = TRUE.


AgentMatrix representing the turtles with updated coordinates and updated data for their previous coordinates prevX

and prevY.


If torus = FALSE and out = TRUE, world 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 `fd()` (i.e., its current position).

     If a given `dist` value is negative, then the `turtle` moves


Wilensky, U. 1999. NetLogo. Center for Connected Learning and Computer-Based Modeling, Northwestern University. Evanston, IL.

See also



Sarah Bauduin


w1 <- createWorld(minPxcor = 0, maxPxcor = 4, minPycor = 0, maxPycor = 4,
                          data = runif(25))
t1 <- createOTurtles(n = 10, world = w1)
points(t1, col = of(agents = t1, var = "color"), pch = 16)

t1 <- fd(turtles = t1, dist = 1)
points(t1, col = of(agents = t1, var = "color"), pch = 16)