An error "Assumed incident matrix must contained negative value for link out." which occurs in creating a graph object.

> graph([1 1 1],[2 3 4])

Error using graph

Assumed incident matrix must contained negative value for link out.

[KSSV]

graph([1 1 1],[2 3 4])

ans = 
  graph with properties:

    Edges: [3×1 table]
    Nodes: [4×0 table]

What does which graph show up?

which graph

/MATLAB/toolbox/matlab/graphfun/@graph/graph.m  % graph constructor

[Ernst Hankel]

Nice tip!

Answer 1

[Walter Roberson]

You are using https://www.mathworks.com/matlabcentral/fileexchange/12648-graph-package

That code does not support passing in source and target vectors.

You are looking at the documentation for the built-in graph() function

Unless there is special reason, you should just remove the File Exchange contribution from your MATLAB path.

[Ernst Hankel]

Nice answer!