# Node labels using networkx

### Question

I'm creating a graph out of given sequence of Y values held by `curveSeq`. (the X values are enumerated automatically: 0,1,2...)

i.e for `curveSeq = [10,20,30]`, my graph will contain the points:

``````<0,10>, <1,20>, <2,30>.
``````

I'm drawing a series of graphs on the same `nx.Graph` in order to present everything in one picture.

My problem is:

• Each node presents its location. i.e the node in location `<0,10>` presents its respective label and I don't know how to remove it.
• There are specific nodes that I want to add a label to, but I don't know how.

for example, for the sequence:

``````[0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9,1,1]
``````

The code is:

``````for point in curveSeq:
cur_point = point
#assert len(cur_point) == 2
if prev_point is not None:
# Calculate the distance between the nodes with the Pythagorean
# theorem
b = cur_point[1] - prev_point[1]
c = cur_point[0] - prev_point[0]
a = math.sqrt(b ** 2 + c ** 2)
pos[cur_point] = cur_point
prev_point = cur_point
#key:
pos[(curve+1,-1)] = (curve+1,-1)

nx.draw(G, pos=pos, node_color = colors[curve],node_size=80)
nx.draw_networkx_edges(G,pos=pos,alpha=0.5,width=8,edge_color=colors[curve])

plt.savefig(currIteration+'.png')
``````
1
11
3/21/2013 1:14:37 PM

You can add the `with_labels=False` keyword to suppress drawing of the labels with `networkx.draw()`, e.g.

``````networkx.draw(G, pos=pos, node_color=colors[curve],
node_size=80, with_labels=False)
``````

Then draw specific labels with

``````networkx.draw_networkx_labels(G,pos, labels)
``````

where labels is a dictionary mapping node ids to labels.

Take a look at this example http://networkx.github.com/documentation/latest/examples/drawing/labels_and_colors.html

20
3/21/2013 4:58:43 PM