t = 30.0

N = 5

N = 8

N = 11

N = 15

Max.absolute error by implicit Euler

0.0025

6.9707E−004

2.4820E−004

0.0045

Root mean square of errors by implicit Euler

0.0015

4.0116E−004

1.3981E−004

0.0023

CPU time

0.018

0.018

0.02

0.042