Can I ask more about "the limits of our implementation of our quadrature 
I wonder when it usually happens. 

Once I calculated drag coefficient, with Q1, my error is 10% compare to 
exact solution. 
However, I can 1.7% error when I use Q2 which is significant decrease!
At Q3, I get 0.4% and At Q4 it starts to increase again 0.5%. 
If I go higher, then my error is more than 100%..... I really want to 
figure out why this happens....

To summarize 
>From Q1~Q3... it shows significant decrease in error
but it is not anymore at Q4 and Q5 

2016년 9월 19일 월요일 오전 8시 8분 21초 UTC-5, Guido Kanschat 님의 말:
> You will also encounter the limits of our implementation of our quadrature 
> formulas and our polynomial evaluation. Both are not stable for high order, 
> and thus at some point approximation will stall.
> Best,
> Guido
> -- 
> Prof. Dr. Guido Kanschat
> Interdisziplinäres Zentrum für Wissenschaftliches Rechnen
> Universität Heidelberg
> Im Neuenheimer Feld 368, 69120 Heidelberg

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