Storage many same dimension matrixes to one matrix

if x1 x2 x3 all 4x4 matrix

i want storage them easy to k=[x1 x2 x3] and i have k matrix 4x12

but when n is larger to 100000

for i = 1:100000

eval( ['x', num2str(i), '=ifft2(randi([0 15],4,4));'] );

end

i use above code to generate 100000 matrixs all matrix are in 4x4 dimension

how can i stoage x1 x2 ... x100000 to a matrix k,k matrix dimesion is 4x400000

any method to do

k=[x1 x2 x3 x4 x5 ........ x100000]

Answer 1

[Chunru]

Try to avoid eval. Use N-D array or cell array instead.

n=10;  %100000
x = zeros(4, 4, n);
for i = 1:n 
    x(:,:,i) = ifft2(randi([0 15], 4, 4));
end

[yiying peng]

thanks a lot.try not to use eval