Ordering flowchart in graphviz

The graph I'd like to produce is a something like this a left-to-right flowchart with a main process at the top, and a series of groupings of stuff below that feed in and out at various points like this: (though this is a dummy example and I want lots of stuff coming in and out from the top code box, which is why a horizontal layout works better than the default

The problem is that this is made in powerpoint...

I can get something close with this:

digraph example {        graph [      rankdir = LR    ]        subgraph cluster_code {      label = "code";      A;      B;      C;      D;    }      subgraph cluster_data {      label = "data";      data_1;      data_2;    }        subgraph cluster_source {      label = "source"      source_1;      source_2    }         A -> B     B -> C     C -> D        data_1 -> A    data_2 -> B    A -> output_1    output_1 -> C        source_1 -> data_1    source_2 -> data_2        #{rank = same; source_2; data_2; A}      }  

But if I try to bring the source and data clusters underneath the code cluster using {rank = same; source_2; data_2; A} (this is hashed out above, and I don't repeat the whole code for brevity of the post), I then A, data_2 and source_2 drop out of the box. I think this is something do do with rank and clusters not playing nicely together.

Any hints on getting something like the first graph above?

Am running graphviz via R/Rstudio and DiagrammeR.

https://stackoverflow.com/questions/65784534/ordering-flowchart-in-graphviz January 19, 2021 at 09:58AM