All paths in directed tree graph from root to leaves in igraph R

Question

Given is a tree:

library(igraph)

# setup graph
g= graph.formula(A -+ B,
                 A -+ C,
                 B -+ C,
                 B -+ D,
                  


        

Answer 1

Based on Gabor's comment:

all_simple_paths(g, from = root, to = leaves)

yields:

[[1]]
+ 3/5 vertices, named:
[1] A B C

[[2]]
+ 3/5 vertices, named:
[1] A B D

[[3]]
+ 3/5 vertices, named:
[1] A B E

[[4]]
+ 2/5 vertices, named:
[1] A C