The for loop always replaces the value previous. How do I store all the values produced from the for loop?

Question

Oliver Ries 2023-5-24

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1972569-the-for-loop-always-replaces-the-value-previous-how-do-i-store-all-the-values-produced-from-the-for

回答： Dea M Turashvili 2023-5-24

I have this for loop with an if statement and every time I run it, it displays both values but the one displayed on top is not saved, but I need to be able to have both of them stored in an array. I tried putting them into an empty array but I dont quite understand how to. Any help would be appreciated. Thanks! This code is just finding outliers, but I need to do something with those outliers but I cant when only one is saved and replacing the other.

Data = [923 916 932 927 908 931 953 926 919 963];
B = sort(Data,'ascend');
n = numel(B);
xmin = B(1);
xmax = B(n);
Q1 = round(.25*(n+1));
Q3 = round(.75*(n+1));
atQ1 = B(Q1);
atQ3 = B(Q3);
IQR = atQ3 - atQ1;
MO = 1.5*IQR;
A = [];
for i = 1:length(B)
    if B(i) <=(atQ1-MO) || B(i) >=(atQ3+MO)
        A(i) = B(i);
        disp(A(i));
        
    end
   
end

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Dyuman Joshi 2023-5-24

在 MATLAB Online 中打开

"it displays both values but the one displayed on top is not saved, but I need to be able to have both of them stored in an array"

It saves both the values.

If that is not the output you want, please specify the desired output.

Data = [923 916 932 927 908 931 953 926 919 963];
B = sort(Data,'ascend');
n = numel(B);
xmin = B(1);
xmax = B(n);
Q1 = round(.25*(n+1));
Q3 = round(.75*(n+1));
atQ1 = B(Q1);
atQ3 = B(Q3);
IQR = atQ3 - atQ1;
MO = 1.5*IQR;
%Growing an array is not a good practice, pre-allocate
A = zeros(size(B));
for i = 1:length(B)    
    if B(i) <=(atQ1-MO) || B(i) >=(atQ3+MO)
        A(i) = B(i);
        disp(A(i))
    end
end
   953

   963
A
A = 1×10
     0     0     0     0     0     0     0     0   953   963

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Answer 1

Dea M Turashvili 2023-5-24

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1972569-the-for-loop-always-replaces-the-value-previous-how-do-i-store-all-the-values-produced-from-the-for#answer_1243854

disp in this case will only display one value at a time because you are specifically indexing with i. However, this doesn't mean that A did not store all the values. If you want to see them all every time, simply write disp(A) instead of disp(A(i))