是否可以从节点绘制箭头到空？(Is it possible to draw arrow from node to nothing?)

是否可以从节点绘制箭头到空？(Is it possible to draw arrow from node to nothing?)

我试图在DiagrammeR::mermaid中绘制一个简单的图表，看起来像：

mermaid(" graph LR A(Sample Text) -->A A-->B B-->A B--> ")

显然（或不） -->A和B-->代码不起作用。 不可能有箭头去或来自哪里。

有一个简单的解决方法（空白节点？/不可见节点？）

I'm trying to draw a simple Diagram in DiagrammeR::mermaid that should looks like:

mermaid(" graph LR A(Sample Text) -->A A-->B B-->A B--> ")

Obviously (or not) -->A and B--> code doesn't work. It's not possible to have an arrow going or coming from nowhere.

Is there a simple work around (blank node ? / invisible node ?)

最满意答案

这个怎么样？

library(DiagrammeR)

mermaid("
     graph LR
        START[.]-->A[Sample Text]
        A-->B
        B-->A 
        B-->STOP[.]

        style START fill:#FFFFFF, stroke:#FFFFFF;
        style STOP  fill:#FFFFFF, stroke:#FFFFFF;
        ")
 
 输出图是： 
 
  
How about this?
 
library(DiagrammeR)

mermaid("
     graph LR
        START[ ]-->A[Sample Text]
        A-->B
        B-->A 
        B-->STOP[ ]

        style START fill:#FFFFFF, stroke:#FFFFFF;
        style STOP  fill:#FFFFFF, stroke:#FFFFFF;
        ")
 
Output diagram is: