Storing values from for loop in array and calling functions

I am writing a function to run an m file multiple times and place all outputs into a matrix named AllSimData. I have a few issues. When I run the code below as is, the output is just the pre-allocated zeros matrix. If I try to have line 10 be AllSimData(ii,:)=MakeFakeData(n); the error is "Subscripted assignment dimension mismatch." I'm not sure how to proceed, as I am new to programming.

function [AllSimData] = catSim( SimNumber,n )
%This function will run MakeFakeData(n)the number of times specified as the
%value of SimNumber. Each output of MakeFakeData is a nx5 matrix. This
%function will concatenate each nx5 matrix vertically, creating a huge nx5
%matrix to represent multiple simulations of data generation.

AllSimData=zeros(10000,5);
for ii=1:SimNumber
   MakeFakeData(n); %n=number of data points/rows in each FakeData set
   AllSimData(ii,:); %Run through all specified iterations of MakeFakeData and add them to array AllSimData.
end

end

Answer 1

[dpb]

If you've got SimNumber simulations and each is n by 5, then the total output needs be--

AllSimData=zeros(SimNumber*n,5);

Then subscript AllSimData(ii,:) is one row and you're trying to smush five rows into it--that's the size mismatch error. You've got to keep a counter as to where the rows are going to go that is (ii-1)*5+1 or 1,6,11,... and the range each time is 1:5,6:10,11:15, ...

So,

i1=1; i2=n;  % initialize counters
for ii=1:SimNumber
  AllSimData(i1:i2,:)=MakeFakeData(n);
  i1=i1+n; i2=i2+n;  % increment counters
end

[jrb13]

Thank you for the help on the pre-allocating! I was wondering if I could do SimNumber*n, but I started with just making a larger array than I thought I'd need until my for loop was accurate.

I'm confused about the counters. I have 5 columns in the matrix, with n number of rows in all columns. Could this work?

i1=1; i2=n;  % initialize counters
for ii=1:SimNumber
  AllSimData(i1:i2,:)=MakeFakeData(n);
  i1=i1+n; i2=i2+n;  % increment counters
end

Thanks again.

[dpb]

My bad; yes, that's correct; add the n rows, not the column count. Made the correction...