MATLAB Answers

Obtaing a Node's ID

8 views (last 30 days)
Tariq Atieh
Tariq Atieh on 19 Feb 2020
Edited: Srijith Kasaragod on 3 Sep 2021
I have a node graph that randomly changes each time. I would like it so when I click on the node graph it selected the clicked node and outs the node ID as a variable. For example, I would like it so when you click on the nodes with nodeID 4 3 and 6. It retruns a variable containing the numbers 4 3 and 6. Thank you for your time.
Tariq Atieh
Tariq Atieh on 19 Feb 2020
numNodes = 64;
numEdge = numNodes;
p = rand(numNodes,2);
st = unique( sort( randi(numNodes, numEdge), 2), 'rows');
G = graph(st(:,1), st(:,2));
gp = plot(G);
gp.XData = p(:,1); gp.YData = p(:,2);
This is my code its just a basic node graph. I just want a way sio that when I click on a node or nodes it puts the NodeIDs in a matrix. Like I click on nodes 1 and 2 I get a matrix of 1 and 2

Sign in to comment.

Answers (1)

Srijith Kasaragod
Srijith Kasaragod on 3 Sep 2021
Edited: Srijith Kasaragod on 3 Sep 2021
Following piece of code shows one possible way to do the same. A button had been added to the figure. Upon selecting required nodes in the figure and clicking on button node labels will be copied and displayed in the command window.
h = figure;
ax = axes(...
'Parent', h,...
'Units', 'normalized',...
'Position', [0.1 0.1 0.8 0.6]);
%define sample graph
G= graph (s,t)
ph= plot(G);
%add a button to the figure
out= uicontrol(...
'Parent', h,...
'Units', 'normalized',...
'Position', [0.1 0.8 0.4 0.1],...
'String', 'Enter',...
'Callback', {@Callback_pb,h,ph});
%button callback function definition
function Callback_pb(~,~,h,ph)
d = datacursormode(h);
vals = getCursorInfo(d);
len_temp= size(vals);
for i=1:len
x= vals(i).Position;
output{end+1}= ph.NodeLabel{find(ph.XData==x(1) & ph.YData==x(2))};
%required output cell array
Refer this link to read more about uibutton.

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!