How to divide an array into sperate vectors.

i have a 1X1000 array, i want to use the first 4 elements in each iteration in a for loop, so the first iteration first 4, second iteration the next 4 elements and so on.

Answer 1

[Fangjun Jiang]

use reshape() to transform it to 4x250 or 250x4 then loop through row or column

[Mohannad Alzard]

Thank you, but do you have any idea how to loop over the first 4 elements too ?, so first loop is to loop over the rows and the second loop is to loop over the first 4 elements of each row.

Thank you.

[Fangjun Jiang]

M=1:1000;
NewM=reshape(M,[],4);
for row=1:size(NewM,1)
for column=1:size(NewM,2)
NewM(row,column)
end
end

Answer 2

[Ameer Hamza]

Another approach is to convert it to a cell array

M; % 1x1000;
M_parts = mat2cell(M, 1, 4*ones(250,1));

for i = 1:numel(M_parts)
    x = M_parts{i}; % x will be 1x4 vector.
    % process 'x' variable
end

[Mohannad Alzard]

Thank you so much!