How to store the results from multiple "for loops" as a matrix

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Oladunjoye 2014-3-22

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https://ww2.mathworks.cn/matlabcentral/answers/122650-how-to-store-the-results-from-multiple-for-loops-as-a-matrix

评论： Oladunjoye 2014-3-24

Hi everyone,

I have a code which outputs a vector and the function value(fvals). The code contains a for loop and the result from the code is stored in a matrix P, where P is a j x 2 matrix, j the number of iteration. The first column of P is the vector, which has length six(6) ,and the second column is fvals. Now I want to add another "for loop" to iterate over k such that P will become a j x 2k matrix i.e. the results for each iteration of the new for loop the solution will be store as new columns in P.

Shown below is a part P at present. What I want is to add new columns by iterating over k.

                first column(vector)                                   second column(fvals)
[0;0;-0.00316499454647002;-0.00316499454647025;1.04719755119660]  -2.04
[0;0;-0.00316499454647002;-0.00316499454647025;2.09439510239320]  -2.04
[0;0;-0.00316499454647002;-0.00316499454647025;3.14159265358979]  -2.04

How can I do this?

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Answer 1

Mischa Kim 2014-3-22

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https://ww2.mathworks.cn/matlabcentral/answers/122650-how-to-store-the-results-from-multiple-for-loops-as-a-matrix#answer_129651

编辑：Mischa Kim 2014-3-22

在 MATLAB Online 中打开

Oladunjoye, use someting like:

 P = zeros(njj,nkk);
 for jj = 1:njj
    ...
    P(jj,1:7) = [col1 col2];  % col1 is the 1-by-6  
    for kk = 1:nkk
        ...
        P(jj,7*kk+1:7*kk+7) = [col11 col22]; 
    end
 end