docs: minor fix in documentation

TODOs.txt

@@ -4,6 +4,9 @@
 sim2start_stop:
 	- .last works now, but adds unneccessary columns if events of the same kind happen right after one another
 
+sim_discrete_time:
+	- should include t = 0 in output (or an option for it)
+
 ####### New Features: #######
 
 sim_from_dag:
@@ -26,4 +29,4 @@ sim2start_stop:
 		- event_durations vector on line 101 needs to be changed to allow different event_durations per different event
 		- the data.table on line 126 needs to include another column including the event type (cause)
 		- probably need to change the dcast() call accordingly on line 133
-		- instead of returning the condition directly on line 149/150, it should return the corresponding event
+		- instead of returning the condition directly on line 149/150, it should return the corresponding event

man/dag2matrix.Rd

@@ -12,7 +12,7 @@ dag2matrix(dag, include_root_nodes=TRUE, include_td_nodes=FALSE)
 }
 \arguments{
   \item{dag}{
-A \code{DAG} object created using the \code{\link{empty_dag}} function with nodes added to it using the \code{+} syntax. See \code{?empty_dag} or \code{?node} for more details. Currently does not support DAGs with time-dependent nodes added using the \code{\link{node_td}} function.
+A \code{DAG} object created using the \code{\link{empty_dag}} function with nodes added to it using the \code{+} syntax. See \code{?empty_dag} or \code{?node} for more details. Supports DAGs with time-dependent nodes added using the \code{\link{node_td}} function. However, including such DAGs may result in cyclic causal structures, because time is not represented in the output matrix.
   }
   \item{include_root_nodes}{
 Whether to include root nodes in the output matrix. Should usually be kept at \code{TRUE} (default).
@@ -50,6 +50,23 @@ dag <- empty_dag() +
 # get adjacency matrix
 dag2matrix(dag)
 
+# get adjacency matrix using only the child nodes
+dag2matrix(dag, include_root_nodes=FALSE)
+
+## adding time-varying nodes
+dag <- dag +
+  node_td("disease", type="time_to_event", parents=c("age", "smoking"),
+          prob_fun=0.01) +
+  node_td("death", type="time_to_event", parents=c("age", "sex", "smoking",
+                                                   "disease"),
+          prob_fun=0.001, event_duration=Inf)
+
+# get adjacency matrix including all nodes
+dag2matrix(dag, include_td_nodes=TRUE)
+
+# get adjacency matrix including only time-constant nodes
+dag2matrix(dag, include_td_nodes=FALSE)
+
 # get adjacency matrix using only the child nodes
 dag2matrix(dag, include_root_nodes=FALSE)
 }