R DiagrammeR Mermaid for Function Maps

Question

How do you produce the following plot using the R function mermaid from the package DiagrammeR?

Function Mapping

EDIT:

Let's just say we drop the labels "Input" and "Output" along with the red circles. The following is a minimal code for a start in R.

DiagrammeR::mermaid("
graph LR
a --> x
b --> y
c --> y
d --> z
classDef firstSet fill:#F8CECC
class a,b,c,d firstSet
")

whose output looks like this:

mermaid-mapping

Specific questions:

How does one make the edges straight and not folded?
How does one include the red circles?

Welcome to Stack Overflow! Your question is clear enough, but it's too broad. You're expected to have made an effort and show where you got stuck. `Diagrammer::mermaid` says the input should be "Diagram in mermaid markdown-like language or file (as a connection or file name) containing a diagram specification.". That means you have to figure out how to **compose the diagram yourself** ... — Ben Bolker, Aug 12 '22 at 21:02

Grasshopper_NZ · Answer 1 · 2022-12-05T10:12:39.877

Try this code below.
It's not perfect (today is the 3rd day that I started learning Mermaid.js) but it has similar elements like your example:

library(DiagrammeR)

grViz("
digraph {
  graph[rankdir = LR, fontsize = 30]
  edge [color = 'blue', penwidth = 3.5]
  node[color = 'white', fontsize = 25]

  subgraph cluster_1 {
        label = 'Input'
        color = 'red'
  node [shape = circle]
  a; b; c; d}
  
  subgraph cluster_2 {
        label = 'Output'
        color = 'red'
  node [shape = circle] 
  x; y; z}


  a -> x
  b -> y
  c -> y
  d -> z
 
}
")

The final outcome looks like this. I may revisit this answer later once I am more proficient.

R DiagrammeR Mermaid for Function Maps

1 Answers1