Hello everybody,

I have some trouble making a network graph directed. This should be possible through the parameters ‘directed=True’. However, in my example below, adding ‘directed=True’ creates double the amount of arrows, which all lead nowhere, whereas without ‘directed=True’ the undirected graph is correctly displayed.

This is a saved png of undirected version (“Undirected.html” in the code below)

and this the directed version (“Directed.html” in the code below) .

If you have any ideas why this is or know where I went wrong, please let me know. Any help would be appreciated.

```
import numpy as np
import pandas as pd
import holoviews as hv
import networkx as nx
from holoviews import opts
from bokeh.models import HoverTool
import os
hv.extension('bokeh')
def nx_graph():
# create an example networkx graph with 4 nodes and edges connecting consecutive nodes
G = nx.Graph()
edge_list = [(1,2), (2,3), (3,4)]
for u,v in edge_list:
G.add_edge(u, v)
return G
def nx_to_hv(nx_ptn_graph):
# positions for the nodes
pos = {1:[0,0], 2:[150, 0], 3:[250, 0], 4:[300, 0]}
# convert to holoviews graph
hv_loads_graph = hv.Graph.from_networkx(nx_ptn_graph, positions=pos)
return hv_loads_graph
def main():
# create a network x graph
G = nx_graph()
# convert it to a holoviews graph
undirected = nx_to_hv(nx_ptn_graph=G)
# save the undirected graph
hv.save(obj=undirected, filename="Undirected.html")
# make the hv graph directed
directed = undirected.opts(inspection_policy='nodes', arrowhead_length=0.05, directed=True)
# save the result
hv.save(obj=directed, filename="Directed.html")
return
if __name__ == '__main__':
main()
```