How to divide an array into sperate vectors.

Question

Mohannad Alzard 2020-10-13

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https://ww2.mathworks.cn/matlabcentral/answers/612851-how-to-divide-an-array-into-sperate-vectors

评论： Fangjun Jiang 2020-10-13

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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Answer 1

Fangjun Jiang 2020-10-13

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https://ww2.mathworks.cn/matlabcentral/answers/612851-how-to-divide-an-array-into-sperate-vectors#answer_512956

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

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Mohannad Alzard 2020-10-13

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 2020-10-13

在 MATLAB Online 中打开

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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Answer 2

Ameer Hamza 2020-10-13

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/612851-how-to-divide-an-array-into-sperate-vectors#answer_512976

在 MATLAB Online 中打开

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