storing a 100x100 matrix from each iteration in a single new matrix

I am running a loop 100 times, and within that i produce a 100x100 matrix (this represents topography, each loop is a pperiod in time).

I would like to store every outut of that loop into a single matrix, as well as its assigned iteration number.

i.e. 100, 100x100 matricies, all assigned to their iteration number.

Topography, 1

Topoography, 2 , etc all in one matrix

I am led to beleive this is possible, but have no idea how to do it!

Answer 1

[dpb]

Two options -- either use a cell array each element of which is a 2D array or a 3D array in which each plane is one time step. Being a fan of using cell arrays only when necessary, I'd most likel choose to go that route which would look like --

N=100;      % set the counter in a variable, don't bury "magic" numbers in code -- can change just data, not code
T=zeros(N,N,N); % preallocate for speed
for i=1:N
  T(:,:,i)=yourfunction(i);         % compute the output arrays, store by plane
end

[Luca Wright]

Thats great thanks!

[Luca Wright]

just to check, where you have "yourfunction", do i have the output that i am pulling out of the function, or the actual function name? When i put the actual function name it gives me an error, but its happy with the output!

[dpb]

You assign the result of the function, presuming the function returns the aforementioned and preallocated 2D array.

If your function returns something different, then whatever is is that is done to get the 2D array needs to be done before assignment.

To diagnose whatever error you actually get, would have to see it in context with the code the generated the error and have a definition of what the function returns...