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)
```

- turtles
`AgentMatrix`

object representing the moving`agents`

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

`turtles`

.- world
`WorldMatrix`

or`worldArray`

object.- torus
Logical to determine if the

`world`

is wrapped. Default is`torus = FALSE`

.- out
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
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 = 1)
points(t1, col = of(agents = t1, var = "color"), pch = 16)
```