I'm studying Wolfgang's lecture 31.65 that deals with picard iteration.

In the lecture, previous_solution_gradients[] is used. But, I also want to 
know How I can use just previous_solution[].

At first, I used previous_solution[q_index] in assemble_system as in 

But, It seems that What I did was wrong...

Could you let me know How I can use previous_solution in the 
assemble_system, as well as previous_solution_gradients?

And... one more thing.

I also want to know maximum value of previous_solution.

So, What I have done is following...

Vector<double>::iterator max;
double max_val;

Is it right way??

Please help me.



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