How to extract a matrix from a series matrix in matlab?

How to extract a matrix from a series matrix in matlab? I mean

F_1,F_2,F_3 and F_4 are all 4*4 square matrix,now i want to extract F_2 from the F_K,what is the code should i write? F_K(2)?

F_K=[F_1 F_2 F_3 F_4];

Answer 1

[madhan ravi]

Store it as a cell array:

F_K={F_1 F_2 F_3 F_4};
%   ^---------------^---- note the brackets
F_K{2}

[Stephen23]

Or, keeping the data in a numeric array:

A = cat(3,F_1,F_2,F_3,F_4);
A(:,:,4)