Code : Tout sélectionner
\begin{forest}
for tree={
math content,
% tree
grow'=east,
edge=semithick,
child anchor=west,
l sep=20mm,
s sep=5mm,
where level=1{s sep=2mm}{},% insert different `s sep`
tier/.option = level,
/tikz/ELS/.style = {% Edge Label Style
pos=0.5, sloped, node font=\footnotesize,
inner sep=2pt, anchor=#1},
EL/.style = {if n=1{% Edge Label, automatic positioned
edge label={node[ELS=south,font=\scriptsize]{$#1$}}}
{edge label={node[ELS=north,font=\scriptsize]{$#1$}}}}
},
[
[R, EL=3/10
[R, EL=3/10]
[B, EL=1/5]
[V, EL=1/2]
]
[B, EL=1/5
[R, EL=3/10]
[B, EL=1/5]
[V, EL=1/2]
]
[V, EL=1/2
[R, EL=3/10]
[B, EL=1/5]
[V, EL=1/2]
]
]
\end{forest}
Merci d'avance.