Error in plotting graph
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Isaac Osei Agyemang
on 11 Oct 2018
Answered: Isaac Osei Agyemang
on 12 Oct 2018
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);
3 Comments
Accepted Answer
More Answers (1)
dpb
on 11 Oct 2018
Edited: dpb
on 11 Oct 2018
graph(s,t)
...
s,t — Node pairs
...
Node pairs, ... graph creates edges between the corresponding nodes in s and t, ...
If s and t are numeric, then they correspond to indices of graph nodes. Numeric node
indices must be positive integers greater than or equal to 1.
...
IOW, there is no such thing as a "Node zero"; the node numbers are like indices into an array or matrix; they are one-based index values to which node, 1 thru N of the nodes in the list.
I don't know what your idea is of what the zero is supposed to represent?
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