How to extract data from a cell array?

Question

Paolo Ottonelli 2020-1-6

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https://ww2.mathworks.cn/matlabcentral/answers/499063-how-to-extract-data-from-a-cell-array

编辑： Paolo Ottonelli 2020-1-6

Hello, it's the first time that i use arrays and I have a series of 3x1 cell arrays, each of them has 3 cells vith a differet numbers of numerical data. I want to use for loop or while loop in order to ectract the three cells and convert them into different 3 vectors:

C={[2.24;2.28;2.31], [0.99;1.44;1.44;1.44;1.44;2.12;2.25;2.48;3.61], [1.86;1.89;1.89;1.89;1.89;1.89;1.89]};

for j=1:length(C)
    x(j)=C{j};
end

at the end I should have:

x1=[2.24;2.28;2.31]

x2=[0.99;1.44;1.44;1.44;1.44;2.12;2.25;2.48;3.61]

x3= [1.86;1.89;1.89;1.89;1.89;1.89;1.89]

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Stephen23 2020-1-6

"..at the end I need to have: x1... x2...x3"

Is there a particular reason why you cannot just use indexing to access your data?

Using numbered variables is certainly possible, but it will force you into writing slow, complex, obfuscated, buggy code that is hard to debug. Read this to know why:

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

Indexing is simple, neat, easy to debug, and very effiicent. Unlike what you are trying to do.

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Answer 1

KSSV 2020-1-6

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https://ww2.mathworks.cn/matlabcentral/answers/499063-how-to-extract-data-from-a-cell-array#answer_408827

Already you have the cells in your desired way.

You can access them using C{1} , C{2}, C{3} .

You need to store them again into X1, X2, X3.

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KSSV 2020-1-6

There is no requirement to do this.

Guillaume 2020-1-6

"but i need to convert my array"

Why? As Stephen pointed out in his comment to your question, this will complicate your code for no useful benefit as far as we can tell. So please explain this need.

Why can't you write C{1} wherever you were going to write X1?

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