How to organize large column in to small Commons.

Question

friet 2018-9-17

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/419439-how-to-organize-large-column-in-to-small-commons

回答： Adam Danz 2018-9-17

Hello I have a large col vector in matlab with size of ~10000. I would like to cut the col at every 100 point as you see it below separate each col. and save it in separate

a1=[x(1:100)];
a2=[x(101:200)];
a3=[x(201:300)];
a4=[x(301:400)];... and so on.

Z=[a1,a2,a3]

However doing like this will take forever. Is ther anyway to do it in loop. Any help is appreciated.

best,

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Answer 1

Adam Danz 2018-9-17

1
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https://ww2.mathworks.cn/matlabcentral/answers/419439-how-to-organize-large-column-in-to-small-commons#answer_337204

在 MATLAB Online 中打开

This requires dynamic variable naming and it's not a good practice. To understand why read this:

https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

Instead, if the length of your vector is a multiple of 100 and your data are numeric, turn your vector into a matrix where each column is your 'a1', 'a2', etc. Here's an example using reshape().

data = rand(10000,1); 
dataMat = reshape(data, 100, []);

Your variable a12 is just column 12

dataMat(:,12)

If your data are not all numeric or the length of your vector is not a multiple of 100, describe your dataset and we can work out a solution using cell arrays.