Splitting an array and working on individual sections.

I have a large MxN array, M and N are both even, how can i split the array into 2x2 smaller arrays and perform operations on each separately?

Answer 1

[David Young]

If you want to put the four smaller arrays into separate variables, you can do it like this (assuming the sizes are even as stated):

topLeft = A(1:end/2, 1:end/2);
topRight = A(1:end/2, end/2+1:end);
bottomLeft = A(end/2+1:end, 1:end/2);
bottomRight = A(end/2+1:end, end/2+1:end);

Then process each small array in any way you like.

But perhaps you want to do this in a loop, processing each quadrant in turn? If so, you can probably work out what to do from the code above, but it it's still a problem please say.