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How to divide an array into sperate vectors.

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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.

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Accepted Answer

Fangjun Jiang
Fangjun Jiang on 13 Oct 2020
use reshape() to transform it to 4x250 or 250x4 then loop through row or column

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Mohannad Alzard
Mohannad Alzard on 13 Oct 2020
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
Fangjun Jiang on 13 Oct 2020
M=1:1000;
NewM=reshape(M,[],4);
for row=1:size(NewM,1)
for column=1:size(NewM,2)
NewM(row,column)
end
end

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More Answers (1)

Ameer Hamza
Ameer Hamza on 13 Oct 2020
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

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