Save data in for loop

Question

Walter 2012-5-31

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/39966-save-data-in-for-loop

评论： messaoudi nada 2021-9-24

I am new to MATLAB and would like to save all my data from a for loop, however, I it just overwrites my variable and I can only see the last value..

for i=1:50 for j=1:10 out=rand; end end

I need 50x10 matrix of output, but only get one value of out

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Answer 1

Thomas 2012-5-31

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/39966-save-data-in-for-loop#answer_49574

在 MATLAB Online 中打开

This video should help:

http://blogs.mathworks.com/videos/2007/08/20/matlab-basics-video/

Eg>

for ii = 1:50
    for jj = 1:10
  out(ii,jj)=rand(1);
    end
end

out will be a matrix of 50*10

Please do not use i,j as variable names as they are inbuilt matlab functions for i and j (complex numbers) Also please read up on how to markup your code in the forum.

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messaoudi nada 2021-9-24

dear @Thomasi need your help please! , im working about machine learning models , so after extracting features from images i have a 12 structure data ,i want to save the data in a reference matrix and test matrix ,i tried this loop but it didn't work it just save the features of the last image in structure ! i don't know what's wrong heare ! hope u can give help to me !

thanks in advance

for i=1:12

for iref=1:10

for jref=1:40

F1=data1_rf.(['p',num2str(iref)]).(['image',num2str(jref)]).Features;

for itst=1:2

for jtst=1:40

TSF=data1_T.(['p',num2str(itst)]).(['image',num2str(jtst)]).Features;

end

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