Question

I have the vector

output = PV_out(:);

I am trying to break this down into some sort of form like – output(K) where output(1) is the first 8760 rows, output (2) is the next 8760 rows etc etc

The vector above is a 236520×1 vector and so I am trying to get 27 “sets” of matrices
does anyone know how to do this?

Thank you

Answer 1

This is a job for reshape:

%# old_output is 236520x1
%# desired is 8760 x 1 x 27 matrix 
new_output = reshape(old_output,8760,1,[]);
size(new_output) %# [8760 1 27]
   ans = [8760 1 27]

This will create an 8760x1x27 matrix where each row is taken sequentially from the vector that was given to it. Note that you should be careful if you give it a matrix as the first input argument (rather than a vector): you should make sure you know in what order the values are being taken. (Leaving the empty [] means it will automatically pick the right size for that dimension. You will still have an error if the numel of the input isn’t evenly divisible by the dimensions you specify.)

Edit: changed dimensions according to comment below.