426 Chapter 7 Numerical Methods
Figure 8 Displacements of the square membrane. Numbers shown are
ui(m)×64.
The regionRis an invertedT: Starting with a rectangle of width 1 and
height 3/4, remove a 1/ 4 × 1 /4squarefromtheupperleftandrightcor-
ners. Take x= y= 1 /4. (See Fig. 9b.)