Easy question - How can I save this variable within the for loop?

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Ashfaq Ahmed 2022-11-30

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https://ww2.mathworks.cn/matlabcentral/answers/1867818-easy-question-how-can-i-save-this-variable-within-the-for-loop

评论： Mathieu NOE 2022-12-1

采纳的回答： Mathieu NOE

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Hi!

I have one easy question, but weridly I am not being to solve the problem. Say I have this very simple code -

for n = 1:10
    A = [1 n 3 4; 5 6 7 8; 9 10 11 12; 13 14 15 16];
    B{n} = A(1,2)*10;
end

How can I save all ten As in a cell/structure? (Just like the code save every updated B)

Thank you!!

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Answer 1

Mathieu NOE 2022-11-30

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1867818-easy-question-how-can-i-save-this-variable-within-the-for-loop#answer_1116593

编辑：Mathieu NOE 2022-11-30

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hello

If I understand correctly , n must be multiple of 10 and that's the only values of interest for A and B, no need to perform other n values computations that are not multiple of 10

you can simply do that

for k = 1:10
    n = k*10;
    A = [1 n 3 4; 5 6 7 8; 9 10 11 12; 13 14 15 16];
    B{k} = A(1,2)*10;
end
B
B = 1×10 cell array
    {[100]}    {[200]}    {[300]}    {[400]}    {[500]}    {[600]}    {[700]}    {[800]}    {[900]}    {[1000]}

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Ashfaq Ahmed 2022-11-30

编辑：Ashfaq Ahmed 2022-11-30

Hi! Yes, you got the point right. But the code is not saving the updated matrix A everytime. I want all 10 A's to be saved!

Just like all the B's are saved in a cell array.

Mathieu NOE 2022-12-1

在 MATLAB Online 中打开

hello again

so you want this ?

for k = 1:10
    n = k*10;
    A = [1 n 3 4; 5 6 7 8; 9 10 11 12; 13 14 15 16];
    B{k} = A;
end
B{1}
ans = 4×4
     1    10     3     4
     5     6     7     8
     9    10    11    12
    13    14    15    16