# Gauss seidel iteration method

1. Feb 19, 2017

### fonseh

1. The problem statement, all variables and given/known data
Using the circled formula , here's what i gt (photo3) , , why the author ignore the blue circled part ??? Is the author wrong ....

If the blue part isnt ignored , i gt this pls refer to the photo 3

which is correct ? The author or me ? Or I'm misunderstanding something ?

2. Relevant equations

3. The attempt at a solution

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• ###### IMG_20170219_204101.jpg
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2. Feb 19, 2017

### BvU

From what I can see, you pick $i = 3$ so there is no question of a summation starting with $j = i + 1$

3. Feb 20, 2017

### fonseh

what do you mean ? Can you explain further ?

4. Feb 20, 2017

### BvU

I can not. It is a matter of you carefully reading what's printed. Write out the $i, j, k$ of the summations in full. The one in the blue frame is empty when $i = 3$: it is a non-starter (there is no $j = 4$).

5. Feb 20, 2017

### fonseh

noted， Thanks

6. Feb 20, 2017

### BvU

You're welcome.