1.How to get (s,t, weights) to generate a graph? The way i used to generate them causes graph error?2.2.Is it possible keep a for loop inside the if statement to take k values only for d(i,j)<tr ,if how to write the statement?

 %n=number of nodes and d(i,j)is the distance between all nodes should be less than transmitting range tr(to establish connection between nodes) 
 N=round((n*n-1)/2)
s=zeros(1,N);
t=zeros(1,N);
weights=zeros(1,N);
 k=1;
    for i=1:n
    for j=(i+1):n
    if d(i,j)<tr
     D(1,k)=d(i,j);
     s(1,k)=i;
     t(1,k)=j;      
    end
     k=k+1
    end
    end
 G = graph(s,t,weights)
plot(G)

[Sneha Kolapalli]

1.Error using matlab.internal.graph.MLGraph Source must be a dense double array of node indices.

Error in matlab.internal.graph.constructFromEdgeList (line 125) G = underlyingCtor(s, t, totalNodes);

Error in graph (line 264) matlab.internal.graph.constructFromEdgeList(...

2.Is it possible keep a for loop inside the if statement to take k values only for d(i,j)<tr ,if how to write the statement.

Answer 1

[Steven Lord]

As Christine Tobler commented in this post, I suspect your s and/or t inputs to graph contain one or more 0 elements. Try trimming the excess points that you didn't fill with data after your loop.

% Fill in part of a vector
% This is a "toy" example; there are better ways to create the final x vector
x = zeros(1, 10);
k = 1;
for z = 1:7
  x(k) = z;
  k = k+1;
end
disp(x)

% Trim unused elements
x(k:end) = [];
disp(x)