Subscripted assignment dimension mismatch

I got an error saying "Subscripted assignment dimension mismatch"

I have this:

clc 
clear all

global Mw M0 H rho g theta sigma dt A Rmax

Mw=0.001; M0=0.001; H=0.1; rho=200; g=10; 
cos(theta)=0.1; sigma=0.03; dt=0.0004; A=0.00005;Rmax=0.001;

Vtotal=A*H;

for i=1:20

          iter=1;    
          Vvoid=0;    
          porosity=0;
          while porosity < 0.2
              R(iter)=Rmax*rand(1);
              Vvoid= Vvoid + pi*(R(iter)^2)*H;
              porosity=Vvoid/Vtotal;
              iter=iter+1;
          end

      Z=zeros(iter-1,2001);
      for t=2:2001

              sum=0; sum1=0;

              for k=1:iter-1
                 [Z(k,t)]=Zcalculator(R(k),Z(k,t-1));
                 sum = sum + pi*(R(k)^2)*Z(k,t);
                 sum1 = sum1 + pi*(R(k)^2)*H;
              end

           recovery(i,t)=100*(sum/sum1);
      end

end

&&&&&& and my error reads as follows::

??? Subscripted assignment dimension mismatch.

Error in ==> GroupProject at 29
               [Z(k,t)]=Zcalculator(R(k),Z(k,t-1));

% does anyone know what is going on???

[Thomas]

what is the function Zcalculator?

Answer 1

[Geoff]

Enter the command:

dbstop if error

Now run your script and wait for it to break.

Then, in the command window, execute the line:

Zcalculator(R(k),Z(k,t-1));

Is it a scalar? Probably not. You are assigning to Z(k,t), which expects a scalar (because you are asking MatLab to put a value into a single element of Z).

By the way, you don't need to put square brackets around Z(k,t) when you do the assignment.