Can any one help me please (it's very urget)?
I have the following problem, i have attached the following equation into a file.
lets suppused i have the following vector :
how i solve the equation (my main problem is how to threat the double sum function with diffrent indexies i.e. i,j) ?
I assume the outer sum is over i and the inner over j (not =i).Originally Posted by cobra
Write sum'_j to indicate that the sum is over j, but skips the term j=i.
There are n+1 terms in sum_i and n terms in sum'_j.
Let A = sum_i Ai = sum_j Aj. Thus sum'_j Aj = A - Ai. Then
= sum_i(nAi - sum'_j Aj)
= sum_i(nAi - (A-Ai))
= sum_i((n+1)Ai - A)
= (n+1)sum_i (Ai) - (n+1)A