如何添加「無關」邊緣

Question

我有這個圖：

digraph G { 
1 [label="car"]; 
2 [label="x"]; 
3 [label="car"]; 
4 [label="y"]; 
5 [label="cdr"]; 
6 [label="cdr"]; 
7 [label="cons"]; 
8 [label="x1"]; 
9 [label="x2"]; 
10 [label="cons"]; 
11 [label="y1"]; 
12 [label="y2"]; 
13 [label="f"]; 
14 [label="f"]; 
15 [label="car"]; 
16 [label="cdr"]; 
17 [label="car"]; 
18 [label="cdr"]; 
1 -> 2; 
3 -> 4; 
5 -> 2; 
6 -> 4; 
7 -> 8; 
7 -> 9; 
10 -> 11; 
10 -> 12; 
13 -> 2; 
14 -> 4; 
15 -> 7; 
16 -> 7; 
17 -> 10; 
18 -> 10; 
} 

，我要添加這些其它邊緣：

1 -> 3 [style="dashed"]; 
2 -> 7 [style="dashed"]; 
3 -> 8 [style="dashed"]; 
4 -> 10 [style="dashed"]; 
5 -> 6 [style="dashed"]; 
6 -> 9 [style="dashed"]; 
7 -> 10 [style="dashed"]; 
8 -> 11 [style="dashed"]; 
9 -> 12 [style="dashed"]; 
13 -> 14 [style="dashed"]; 
15 -> 8 [style="dashed"]; 
16 -> 9 [style="dashed"]; 
17 -> 11 [style="dashed"]; 
18 -> 12 [style="dashed"]; 

，但不改變佈局。 我嘗試將邊緣權重設置爲0，但它不起作用。

感謝

Answer 1

你可以簡單地添加無關邊緣前加

edge[constraint=false]; 

。

沒有：

隨着邊緣：

（仍然顯得有些小的變化）