how i put this graphic in function of time ?

clearvars;
 
% X=xv = Aceleração
% Y=yv = Massa
%Z = força

xv = linspace(0, 2 ); 
yv = linspace(0,2 ); 
[X, Y] = ndgrid(xv, yv ); 
Z = X.*Y;

 
surf(X, Y, Z, 'edgecolor', 'none '); 
xlabel('Massa'); 
ylabel('Aceleração'); 
zlabel('z');

xv2 = linspace(0, 3 ); 
yv2 = linspace(0,3 );

[X, Y] = ndgrid(xv2, yv2 );
Z = sqrt((2.*X.*yv)./Y);

surf(X, Y, Z, 'edgecolor', 'none '); 
xlabel('Gravidade'); 
ylabel('Raio'); 
zlabel('z');

HERE ARE a EXEMPLE , my teacher tell me to use it, but i can't use in my equation :

sol = pdepe(m,@pdefun,@icfun,@bcfun,xmesh,tspan);
[xmesh,tspan] = meshgrid(xmesh,tspan);
surf(xmesh,tspan/3600,sol);
xlabel('Raio R'); ylabel('Time t'); zlabel('Temperatura T(r,t)');
title('Temperatura em função do raio e do tempo')
view([105 5]);


figure; grid on; hold on;
xlabel('x'); ylabel('u(x,t)');
ylim([min(T0,Tinf),max(T0,Tinf)]); 
v = VideoWriter('difusao.avi');
v.FrameRate = 20;
open(v);
nt = length(tspan);
for i=1:nt
    plot(xmesh(1,:),sol(i,:),'LineWidth',2)
    set(gca,'nextplot','replacechildren'); 
    frame = getframe(gcf);
    writeVideo(v,frame);
%     pause(1);
end
l = num2str(tspan(:,1)/3600); 
legend(l);
xlabel('Distance x'); ylabel('u(t,x)');
title('several times'); hold off; grid on;
close(v);