> Reference > > dynwrap :: Adapting a trajectory model > Root the trajectory

Root the trajectory

Roots the trajectory by changing the directionality of all edges given a root cell

add_root(trajectory, root_cell_id = trajectory$root_cell_id,
  root_milestone_id = trajectory$root_milestone_id, flip_edges = TRUE)

add_root_using_expression(trajectory, features_oi,
  expression_source = "expression")

is_rooted(trajectory)

Arguments

trajectory	The trajectory as created by `infer_trajectory()` or `add_trajectory()`
root_cell_id	The root cell id, not required if root_milestone_id is given
root_milestone_id	The root milestone id, not required if root_cell_id is given
flip_edges	Whether to flip edges which are going in the other direction compared to the root
features_oi	The feature ids which will be used to root
expression_source	Source of the expression, either a string or a matrix