Is the Gauss-Seidel Iteration Method Misunderstood in Homework Solutions?

[fonseh]

Homework Statement

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 isn't ignored , i gt this pls refer to the photo 3

which is correct ? The author or me ? Or I'm misunderstanding something ?
[/B]

Homework Equations

The Attempt at a Solution

 

[BvU]

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

 

[fonseh]

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

what do you mean ? Can you explain further ?

 

[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 $j = 4$).

 

[fonseh]

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 $j = 4$).

noted， Thanks

 

[BvU]

You're welcome.