clear 
clear path 
whos
global Nx Ny Nz
global lat long dz dm mdep
global delt_su su_its t_su delt
global descriptor this_path
global f deltaf Q beta r_expt r_heat H
global time rots it
global g Cp rho_bar alpha
global w3d
global iterations


param_file_name =   ...
   input(' Please enter the name of the m-file with the parameters for this run : ','s') ;
feval(param_file_name) ;
path   = this_path 
cmdstr=['cd ' path ];
eval(cmdstr);
path=pwd

figure;hold on

sizeit=size(iterations);
centralw=zeros(sizeit(1),Nz+1);

for i=1:sizeit(1)
ufilename=(['U.' iterations((i),1:10) ]);
vfilename=(['V.' iterations((i),1:10) ]);
u=rdmeta(ufilename,'b');
v=rdmeta(vfilename,'b');
w=zeros(Nx,Ny,Nz+1);
for k=Nz:-1:1,
 w(1:Nx-1,1:Ny-1,k)= w(1:Nx-1,1:Ny-1,k+1)...
                    -u(2:Nx,1:Ny-1,k)*dz(k)/dm +u(1:Nx-1,1:Ny-1,k)*dz(k)/dm ...
                    -v(1:Nx-1,2:Ny,k)*dz(k)/dm +v(1:Nx-1,1:Ny-1,k)*dz(k)/dm ;
end
centralw(i,:)=w(Nx/2,Ny/2,:);
plot(eval(iterations((i),1:10)),centralw(i,Nz/2),'o');drawnow
end

title(descriptor)
xlabel('timestep')
ylabel('central mid-depth w (m/s)')
grid