clear path 

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 u v t w
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) ;


iterations

itstart = input(' Please enter start iteration : ','s') 
itend = input(' Please enter end iteration : ','s') 


sizeit=size(iterations);
for i=1:sizeit(1)
iter(i)=eval(iterations(i,1:10));
end
nitstart=find(iter==eval(itstart))
nitend=find(iter==eval(itend))

path   = this_path 
cmdstr=['cd ' path ];
eval(cmdstr);
path=pwd

sumtheta=zeros(Nx,Ny,Nz);
counter=0;

for i=nitstart:nitend
tfilename=(['T.' iterations((i),1:10) ]) ;
t=rdmds(tfilename,'b');
sumtheta=sumtheta+t;
counter=counter+1;
end
meantheta=sumtheta/counter;


sum=zeros(Nx,Ny);
by=zeros(Nx,Ny);
bx=zeros(Nx,Ny);

for k=Nz:-1:1,
  sum=sum-9.8*dz*0.0002*(meantheta(:,:,k)-20);
end

bx(2:Nx-1,:)=(sum(3:Nx,:)-sum(1:Nx-2,:))/(2*dm);
by(:,2:Ny-1)=(sum(:,3:Ny)-sum(:,1:Ny-2))/(2*dm);

counter=0;
sumc=0;
for i=1:Nx
for j=1:Ny

r=sqrt((i-Nx/2)*(i-Nx/2)+(j-Ny/2)*(j-Ny/2))*dm;

if r<0.5
counter=counter+1;
sumc=sumc+bx(i,j)*bx(i,j)+by(i,j)*by(i,j);
end

end
end

sumc=sumc/counter/f;
wek=0.000057;
cc=wek/sumc