I need your help.
I compute the exact solution u(x,y,t) os PDE.
My code : PDEs.mw
I would like to plot the exact solution of my PDE.
My method work well but when I put a:=1; b:=1; In the next lines there is no change, always I have a and b in my equation.
If i fix the time, "t=1 or 2 " for example; In the last lines i plot( u(x,y,2)); but doesn't work also.
Then animation in "t" how....
Thanks for your help.