How to create array from saved iterations of a loop

Question

Joseph McGorry 2021-8-23

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https://ww2.mathworks.cn/matlabcentral/answers/1438699-how-to-create-array-from-saved-iterations-of-a-loop

评论： Stephen23 2021-8-23

I am wondering how I would create an array of numbers from a loop in matlab. After every iteration a number is saved and I want to be able to put all these outputs in one array. My outputs look like

x = 2
x = 3
x = 4 

and so on.....

I want it so at the end of the loop the answer says

x = [2,3,4]

Thank you in advance

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Answer 1

Joseph McGorry 2021-8-23

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https://ww2.mathworks.cn/matlabcentral/answers/1438699-how-to-create-array-from-saved-iterations-of-a-loop#answer_772589

在 MATLAB Online 中打开

For anyone wondering, initialise

x = [];

and then to call it outside the loop

x = [x,y]

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Stephen23 2021-8-23

Better:

https://www.mathworks.com/help/matlab/matlab_prog/preallocating-arrays.html

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Answer 2

Awais Saeed 2021-8-23

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https://ww2.mathworks.cn/matlabcentral/answers/1438699-how-to-create-array-from-saved-iterations-of-a-loop#answer_772569

在 MATLAB Online 中打开

Just store them column by column

for jj = 1:1:5
	x(jj) = jj
end

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Joseph McGorry 2021-8-23

this doesn't work for me because it just keeps iterating over heaps changing variables

Awais Saeed 2021-8-23

I do not know how your code is working but if you are getting values saved (as you said in question) then you should be able to save them as arrays

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