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Question: 2D Wave Equation Plot3d

Question:2D Wave Equation Plot3d

st0812 15 Maple
sum homework plot3d
December 06 2017
2
lambda:=unapply(5*Pi*sqrt((m^2)/16+(n^2)/4),m,n):'lambda[m,n]'=lambda(m,n);
                     
 u:=(x,y,t)->0.426050*sum(sum((1/(m^3*n^3))*cos(lambda*t)*sin(m*Pi*x/4)*sin(n*Pi*y/2),m=1..infinity),n=1...infinity);
 
lambda value depends on m and n. m and n are odd numbers. We write 2 * m-1 and 2 * n-1 instead of m and n. x = 0: 0.01: 4 and y = 0: 0.01: 2 and t = 0.01.
How can I draw a 3D plot? Where do we  write 0.01 in increments of amount?   in the Grid command?Or how do we plot for the direct x = 0 ... 4 and y = 0 .... 2 and t = 0.01?
 
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