addedge function not working

Matlab will not allow me to use the 'addedge' function, i am not sure why. my orginal network is huge so i tried to use it with a smaller graph. here is my script,

p = [0 1 0 1; 1 0 0 0; 0 0 0 0; 1 0 0 0];

plot(graph(p));

addedge(p,3,4);

i understand that the three inputs to the function are the graph 'p' and the nodes i would like the edge added between which i have put 3 and 4.

This is the error message i am receiving. 'Check for missing argument or incorrect argument data type in call to function 'addedge'.'

can anyone help me with how i can get it to work.

Answer 1

[Steven Lord]

The addedge function is defined for graph and digraph objects. It is not defined for double arrays. You need to build a graph or digraph object (as you did inside your plot call) and call addedge on that object (with an output argument that will contain the modified graph or digraph.)

[Nicolle Small]

Thank you. I will give it another try.