how to access value of edge weight in a biograph?

ed=getedgesbynodeid(bgraph,'3','8'); >> wt=get(ed,'Weight'); consider the code,I want to access the value of weight of the edge? printing wt gives an empty array.

[Abhishek]

Hi, did you try doing this?

get(bgraph.nodes,'ID').

This gives the list of nodes. A probable guess is that the node ID(3 and 8) are wrong. You have to check it.

Answer 1

[Steven Lord]

Since the biograph class was removed from Bioinformatics Toolbox in release R2022b, in order to access the weight of an edge using graph or digraph, use findedge and index into the Edges table in the graph or digraph object.

rng default % Generate the same R matrix each time
            % so I can select an edge I KNOW will be in the digraph
R = sprand(10, 10, 0.1);
D = digraph(R)

D = 
  digraph with properties:

    Edges: [9x2 table]
    Nodes: [10x0 table]

allEdges = D.Edges % Show the complete list of edges, so we can use it to check our answer later

allEdges = 9x2 table
    EndNodes     Weight 
    ________    ________

     1     2     0.65574
     2    10    0.035712
     3     5     0.84913
     6    10     0.93399
     7     9     0.67874
     9     2     0.75774
    10     5     0.74313
    10     8     0.39223
    10    10     0.65548

E = findedge(D, 7, 9) % Which edge connects nodes 7 and 9?

E = 5

weightEdge7_9 = D.Edges{E, 'Weight'} % What is the weight of that edge?

weightEdge7_9 = 0.6787

% check
edgeInformation = allEdges(E, :)

edgeInformation = 1x2 table
    EndNodes    Weight 
    ________    _______

     7    9     0.67874

edgeInformation shows that edge 5 is in fact the edge between nodes 7 and 9 in digraph D, and the value in the Weight variable of edgeInformation matches the value in weightEdge7_9.