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Çó½âƫ΢·Ö·½³Ì×éʱÓöµ½µÄ£¬Çë¸ßÊÖÖ¸µã¡£ ÏÂÃæÊÇÎļþºÍ´íÎóÌáʾ function pdex4 m = 0; x = [0 0.005 0.01 0.05 0.1 0.2 0.5 0.7 0.9 0.95 0.99 0.995 1]; t = [0 0.005 0.01 0.05 0.1 0.5 1 1.5 2]; sol = pdepe(m,@pdex4pde,@pdex4ic,@pdex4bc,x,t); u1 = sol(:,:,1); u2 = sol(:,:,2); u3=sol(:,:,2); figure surf(x,t,u1) title('u1(x,t)') xlabel('Distance x') ylabel('Time t') figure surf(x,t,u2) title('u2(x,t)') xlabel('Distance x') ylabel('Time t') figure surf(x,t,u3) title('u3(x,t)') xlabel('Distance x') ylabel('Time t') % -------------------------------------------------------------- function [c,f,s] = pdex4pde(x,t,u,DuDx) c = [1; 1;1]; f = [0; 0;0] .* DuDx; F = 6*u(3); s = [-F*u(1); u(2)*F;-20000*u(1)-2-4*u(2)]; % -------------------------------------------------------------- function u0 = pdex4ic(x); u0 = [0.03;0;0]; % -------------------------------------------------------------- function [pl,ql,pr,qr] = pdex4bc(xl,ul,xr,ur,t) pl = [0; ul(2)-1;0]; ql = [1; 1;1]; pr = [ur(1)-1; 0;0]; qr = [1;1;1]; ´íÎóÐÅÏ¢ Warning: Failure at t=1.497828e-002. Unable to meet integration tolerances without reducing the step size below the smallest value allowed (2.775558e-017) at time t. > In ode15s at 809 In pdepe at 317 In pdefun001 at 6 Warning: Time integration has failed. Solution is available at requested time points up to t=1.000000e-002. > In pdepe at 323 In pdefun001 at 6 ??? Error using ==> surf at 78 Data dimensions must agree. Error in ==> pdefun001 at 12 surf(x,t,u1) |
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