forest: How to influence length of edge (make the tree more compact)

Question

I use forest for the first time and have trouble understanding the (very good) manual.
I want to make the tree more compact (see annotation).
Which parameter controls that?

\documentclass{article}
\usepackage[edges]{forest}
\begin{document}
\begin{forest} 
    forked edges,

    for tree = {
        align = center, % needed for "\" in nodes.
        draw,
        font = \tiny,

        where level = 0{
        }{
          folder,
          grow' = 0,
        },

    },
 [0
     [1]
     [\ldots]
     [2
        [2.1]
        [2.2]
        [\ldots]
        ]
     [3
        [3.1]
        [3.2]

        ]
     [4
        [4.1
            [4.1.1]
            [4.1.2]
            [4.1.3]
            [4.1.4]
            [4.1.5]

            ]

        [5.1
            [5.1.1]
            [5.1.2]
            [5.1.3]
            [5.1.4]
            [5.1.5]

            ]

        ]
 ]
\end{forest}
\end{document}

score 8 · Accepted Answer · answered Mar 19 '21 at 06:51

8

The topmost gap can be shortened using l=something on the children of the root (I have set it to 0.6 of the original l), but note that as we are shortening the distance, we also need to set l sep=0 on the root node.

The other gaps are artefacts of using folder multiple times on each node. The thing is, in the original code, folder resides within two loops, for tree and where level. That's a bad idea even in general, as it uses more time, but in this tree, the effect is visible as well. I usually suggest if level instead of where level in these cases, but here, for tree followed by for descendants seems even more elegant.

\documentclass{article}
\usepackage[edges]{forest}
\begin{document}
\begin{forest} 
  forked edges,
  l sep = 0, for children = {l*= 0.6},
  for tree = {
    align = center, % needed for "\" in nodes.
    draw,
    font = \tiny,

  },
  for descendants={
    grow' = 0,
    folder,
  },
  [0
    [1]
    [\ldots]
    [2
      [2.1]
      [2.2]
      [\ldots]
    ]
    [3
      [3.1]
      [3.2]

    ]
    [4
      [4.1
        [4.1.1]
        [4.1.2]
        [4.1.3]
        [4.1.4]
        [4.1.5]

      ]

      [5.1
        [5.1.1]
        [5.1.2]
        [5.1.3]
        [5.1.4]
        [5.1.5]

      ]

    ]
  ]
\end{forest}
\end{document}

answered Mar 19 '21 at 06:51

Sašo Živanović

11,732

Thanks for the good explanation! – Dr. Manuel Kuehner Mar 19 '21 at 07:42
Is there a way to put 4.1 and 5.1 (which should be named 4.2 :)) side by side so that less vertical space is needed? I can create a new question if that is needed. – Dr. Manuel Kuehner Mar 19 '21 at 07:45
2

There is: we need to make 4 a forked edges (instead of folder) node --- which is a bit tricky to achieve, as I don't think it would work if we first made it a folder and then a forked edges node. And I agree, it is more appropriate if this is a new question. – Sašo Živanović Mar 19 '21 at 07:51
Ok. I go to bed now and will post a question tomorrow. I will post the link here in the comments. Thanks again. – Dr. Manuel Kuehner Mar 19 '21 at 07:53
FYI, this is the follow-up question: https://tex.stackexchange.com/questions/588083/ – Dr. Manuel Kuehner Mar 19 '21 at 17:44
Ahhhh - I feel stupid now. I just now was told by marmot that you are the author of forest - I wasn't aware of it! Thanks for taking the time! – Dr. Manuel Kuehner Mar 21 '21 at 21:12

forest: How to influence length of edge (make the tree more compact)

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