MATLAB: Please Help with Number Arrangement

arrangementnumbers

Good Day!
I am having a problem regarding arrangement of numbers.
I have a matrix of
[1 2;
 2 3;
 3 4;
 3 5;
 4 6;
 6 7];
First, I want to find the end node. In this example, 5. Then 5 is connected to 3 and a process will be performed. After that, the program must go to 7 which is connected to 6 and 4. when the program detects that the number is 4 it will stop and another operation will be performed.
Please help me. Any tips will do.
Thanks
Regards Dhon Xean

Best Answer

Do you mean something like this?
prompt = 'What is your test value? \n';
TestNo=input(prompt); %Test No.
a=[1 2;
 2 3;
 3 4;
 3 5;
 4 6;
 6 7];
b= a(:,2)==TestNo; %Location
c=a(b,1);
d= a(:,2)==c;
if d == zeros(size(d))
    if c == 4;
        msgbox('another program will start');  
    end
else
    e= a(d,1);
    if e == 4;
        msgbox('another program will start');
    end
end
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