MATLAB: Error in plotting graph

graph

Hi community, please I'm try to plot a graph from a gml file containing data. I'm getting an error when i try to create the graph. The error reads "Error using matlab.internal.graph.MLGraph. Target must be a dense double array of positive integer node indices."
This is my code.
%Extracting edges from gml file graph
fileName = 'power.gml';
inputfile = fopen(fileName);
Edges=[];
l=0;
k=1;
while 1
  % Get a line from the input file
  tline = fgetl(inputfile);
  % Quit if end of file
  if ~ischar(tline)
    break
  end
  nums = regexp(tline,'\d+','match');
  if length(nums)
    if l==1
      l=0;
      Edges(k,2)=str2num(nums{1});  
      k=k+1;
      continue;
    end
    Edges(k,1)=str2num(nums{1});
    l=1;
  else
    l=0;
    continue;
  end
  if Edges(:,2)== 0
    Edges (:,2) = 1;
  end
end
Edges = Edges+1;
G = graph(Edges(:,1), Edges(:,2));      % create a graph from A
figure                                  % visualize the graph
plot(G);

Best Answer

Got it working now, did some editing..
%Extracting edges from gml file graph
fileName = 'power.gml';
inputfile = fopen(fileName);
Edges=[];
l=0;
k=1;
while 1
  % Get a line from the input file
  tline = fgetl(inputfile);
  % Quit if end of file
  if ~ischar(tline)
    break
  end
  nums = regexp(tline,'\d+','match');
  if length(nums)
    if l==1
      l=3; % the 0 here was the problem...
      Edges(k,2)=str2num(nums{1});  
      k=k+1;
      continue;
    end
    Edges(k,1)=str2num(nums{1});
    l=1;
  else
    l=0;
    continue;
  end
end
Edges = Edges+1;
G = graph(Edges(:,1), Edges(:,2));      % create a graph from A
figure                                  % visualize the graph
plot(G);
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