Index exceeds matrix dimensions error?

L =[1 2 0.1 
    1 4 0.05 
    1 5 0.08 
    2 3 0.05 
    2 4 0.05 
    2 5 0.1 
    2 6 0.07 
    3 5 0.12 
    3 6 0.02 
    4 5 0.2 
    5 6 0.3 ]
ln = L(:,1);
rn = L(:,2);
X  = L(:,3);
Q=[1;2;3;4;5;6]
for i = ln 
    j = rn
    
    Pt(i,j)=(Q(i)-Q(j))/X(i,j);      %Transmission power
end

the answer im looking for is pt(1,2),pt(1,4),pt(1,5),pt(2,3),pt(2,4),pt(2,5),pt(2,6),pt(3,5),pt(3,6),pt(4,5),pt(5,6)

i should have 11 pt but i get Index exceeds matrix dimensions error? and believe me i tried many things but still have the problem..so help me please..

[KSSV]

To have 11 pt, your should have 12 Q's. But you have only 6 here. Rethink on your problem.

[arian hoseini]

so thats the problem but i dont need 12 Q's you know for example pt(1,2)=(Q(1)-Q(2))/X(1,2)

Q(1)=1,Q(2)=2,X(1,2)=0.1....

or pt(2,6)=(Q(2)-Q(6))/X(2,6)......Q(2)=2,Q(6)=6,X(2,6)=0.07

Answer 1

[Matt J]

Pt=( L(:,1)-L(:,2)  )./L(:,3)