clear 
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') 
radmean = input(' Please enter radius of mean in gridpoints (ie 42) : ') 

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;

% create circular sampling rings


Nn=Nx/2;

rad=[1:1:(Nn-1)];
ring=ones(Nx,Ny,Nz);
weight=zeros(1,Nn-1);
radialmean=zeros(1,Nn-1);
XCenter = (Nx+1)/2 ;
YCenter = (Ny+1)/2 ;


for k=1:Nn-1
  for i=1:Nx
    for j=1:Ny
      radius(i,j) = sqrt((i-XCenter)^2+(j-YCenter)^2);
    end
  end
  radius(find( round(radius) > (k+1) ))=radius(find (round(radius) > (k+1) ))*0;
  radius(find( round(radius) < (k)   ))=radius(find (round(radius) < (k)   ))*0;
  radius(find(radius>0))=1.0;
  ring(:,:,k)=radius;
  weight(:,k)=length(find(ring(:,:,k) > 0));
end

for i=nitstart:nitend
tfilename=(['T.' iterations((i),1:10) ]) ;
t=rdmeta(tfilename,'b');
for j=1:30
tring=t(:,:,j).*ring(:,:,radmean);
meant(j)=sum(sum(tring))/weight(radmean);
end
sumtheta=sumtheta+meant;
counter=counter+1;
end


plot(meant,mdep,'o-')