why "while loop" is not working?

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Artur Iskhakov
Artur Iskhakov 2020-7-3
评论： Artur Iskhakov 2020-7-3
Hi! My task is to find all nodes that go after node "3" in directed graph "gr". In order to make it I used the "successors" function and while loop. But while loop is not working. Can anybody help me please? Here's the code:
clc;
A = [1 2 3 4 5 6 7];
B = [2 3 4 5 6 7 8];
w = [0 0 1 0 0 0 0];
gr = digraph (A,B, w);
N = successors (gr,4)
i=0;
while TF == 0
TF = isempty (N);
N = successors (gr, N);
i = i + 1;
N(i)= N;
end
  2 个评论
Artur Iskhakov
Artur Iskhakov 2020-7-3
It is a variable that equals to logical 1 when matrix "N" is empty and to logical 0 when matrix "N" is not empty.

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Vashist Hegde
Vashist Hegde 2020-7-3
To check what was going on, I wrote a small while loop on my own -
This while loop is also not working. The similarity between this code and your code is that you have not initialized TF. so when I put break points, and ran this stepwise, I found that when a variable is not initialized and is used, it is by default set to 1.
So TF has a value of 1, and hence the loop is never entered.
I suggest you to initialize TF.
while TF==0
disp('hi');
TF=1;
var = randi(5);
if var==4
TF=3;
end
end

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