Simple DiGraph Plot Directed Graph: no method matching

General Usage
1

Hi all,

I am reading this post:

but when I try the code:

# Load the packages
using LightGraphs, GraphPlot, MetaGraphs, GraphRecipes, Plots

# Load the adjacency matrix and graph attributes
mat_arcTwoNodes = [0    1    0    0    0    0    0    0    0    0;
0    0    0    0    0    1    0    0    0    0;
0    0    0    0    0    0    0    0    0    1;
1    0    0    0    1    0    0    0    0    0;
0    0    0    0    0    1    0    0    0    0;
1    0    0    1    0    0    0    1    0    0;
0    1    1    0    0    0    0    0    0    0;
0    0    0    0    0    0    0    0    1    0;
0    0    0    0    1    0    0    0    0    0;
0    0    0    0    0    1    1    0    1    0]
vec_xNode = [1    3    8    2    4    5    6    7    9    9]
vec_yNode = [1    2    1    7    9    5    3    7    9    4]

# Create a generic graph
gr = SimpleDiGraph()
add_vertices!(gr, size(mat_arcTwoNodes, 1))
# Add edges based on the adjacency matrix
for i in 1:size(mat_arcTwoNodes, 1), j in 1:size(mat_arcTwoNodes, 2)
    if mat_arcTwoNodes[i,j] != 0
        add_edge!(gr, i, j)
    else
        nothing
    end
end
# Attach the metagraph to the original graph
mgr = MetaDiGraph(gr)
# Add the attribute of nodes
for i in 1:size(mat_arcTwoNodes,1)
    set_props!(mgr, i, Dict(
        Symbol("vec_xNode") => vec_xNode[i],
        Symbol("vec_yNode") => vec_yNode[i]
        ))
end
# Plot the graph
graphplot(gr, x=vec_xNode, y=vec_yNode)

there is an error:
LoadError: MethodError: no method matching Graphs.SimpleGraphs.SimpleDiGraph(::SimpleDiGraph{Int64})

2

Try using Graphs.jl rather than LightGraphs.jl.

Stackoverflow answers sometimes get out of date - since that answer was written, LightGraphs.jl has been discontinued in favour of Graphs.jl.

With that change, the graph construction code works for me.

1 Like
3

Yes, I think SoF is not as updated as Julia Discourse. This forum is really handy and fast.