How to export array elements?

Hi all,

I have an big array say the size is 40000 by 1 i.e. 40000 rows and 1 column. I want to export effeciently according to index as below

For make it simple.lets make the array A size 20 by 1

Now, export the array as X1 = [x1,x2,x11,x12];

X2 = [x3,x4,x13,x14];

X3 = [x5,x6,x15,x16];

X4 = [x7,x8,x17,x18];

X5 = [x9,x10,x19,x20];

Tannks in advance.

Answer 1

[Akira Agata]

How about the following?

A = (1:20)';

N = numel(A);
idx = mod(0:N-1,10)' <= 1;

X = cell(5,1);
for kk = 1:5
  X{kk} = A(idx)';
  idx = circshift(idx,2);
end

disp(X)

    {[ 1 2 11 12]}
    {[ 3 4 13 14]}
    {[ 5 6 15 16]}
    {[ 7 8 17 18]}
    {[9 10 19 20]}

[Rubel Ahmed]

@Akira Agata thanks,Solved!!

Answer 2

[Walter Roberson]

per_group = 2; stride = 5;
B = reshape(permute(reshape(A, per_group, stride, []), [1 3 2]), per_group*stride, []);

The columns of B are now the extracts. You could num2cell(B,1) if you wanted to get them into individual cell arrays.