Subgraph layout in graphviz

Question

I have code to display two subgraphs:

graph {
    rankdir=LR;
    subgraph cluster01 {
        label="t=0"
        a0 [label="A"];
        a1 [label="B"];
        a2 [label="C"];
        a5 [label="E"];
        a0 -- a1;
        a1 -- a2 ;
        a2 -- a0;
    };

    subgraph cluster02
    {
        label="t=10"
        b0 [label="A"];
        b5 [label="E"];
        b1 [label="B"];
        b2 [label="C"];

        b0 -- b1;
        b2 -- b5;
    };

    a0--b0 [style=dotted];
    a1--b1 [style=dotted];
    a2--b2 [style=dotted];
    a5--b5 [style=dotted];
}

This code displays two subgraphs like this:

But I want to have it like this:

I hope someone will help me fix the "rankdir" to get it done.

Robedechambre

Answer 1

The following was achieved by using invisible edges and constraint=false on some edges:

graph {
    rankdir=LR;
    subgraph cluster01 {
        label="t=0";
        a0 [label="A"];
        a1 [label="B"];
        a2 [label="C"];
        a5 [label="E"];
        a0 -- a1;
        a1 -- a2;
        a2 -- a5 [style=invis];
        a2 -- a0 [constraint=false];
    };

    subgraph cluster02
    {
        label="t=10"
        b0 [label="A"];
        b5 [label="E"];
        b1 [label="B"];
        b2 [label="C"];

        b0 -- b1;
        b1 -- b2 [style=invis];
        b2 -- b5;
    };

    edge[constraint=false];
    a0--b0 [style=dotted];
    a1--b1 [style=dotted];
    a2--b2 [style=dotted];
    a5--b5 [style=dotted];
}

Potheen

Is there definitely no way to set positions of subgraphs? (As above or below each other?) – Hargett

Technically, you can set the bb (bounding box) attribute of the cluster, but you also have to set the positions (pos) of all the nodes in the graph. Then use neato -n. Doable for a graph like above, but not trivial. – Brachylogy