Obtaing a Node's ID

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.

[KSSV]

Show us how the graph is...how did you plot the graph?

[Tariq Atieh]

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

Answer 1

[Srijith Kasaragod]

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
s={'A','A','B','C'};
t={'B','C','C','D'};
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);
    output={};
    len_temp= size(vals);
    len=len_temp(2);
    for i=1:len
        x= vals(i).Position;
        output{end+1}= ph.NodeLabel{find(ph.XData==x(1) & ph.YData==x(2))};
    end
    %required output cell array
    output
end

Refer this link to read more about uibutton.