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how to append a matrix with a nested for loop?

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nines 2022-6-29

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https://ww2.mathworks.cn/matlabcentral/answers/1750515-how-to-append-a-matrix-with-a-nested-for-loop

回答： NIVEDITA MAJEE 2022-6-29

采纳的回答： NIVEDITA MAJEE

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Hello,

I have a nested for loop where I want to append the matrix for every for loop.

subjs = {'subj1' 'subj2'}
experiments = {'groundtruth' 'change1' 'change2'} 
percent_change_matrix = [] %preallocating
percent_change_control_matrix = []
 
for s = 1:length(subjs) 
    subj = subjs{s}
for i = 1:length(experiments)
    experiment = experiments{i}
     
data = load(fullfile('text.txt']))
data = data(:,5)
data(:,i)=data
task(:,i) = data(5,5)
baseline(:,i) = data(5,5)
percent_change(:,i) = ((task-baseline)/baseline)*100
end
percent_change_matrix = [percent_change_matrix; percent_change]
end

where I want my output matrix to look as follows:

groundtruth change1 change2

subj 1 0 10 12

subj2 0 10 12

when right now my output looks like this:

0

0

10

12

0

12

Do you have any suggestions?

Thanks

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采纳的回答

NIVEDITA MAJEE 2022-6-29

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1750515-how-to-append-a-matrix-with-a-nested-for-loop#answer_996425

Hello,

Please take a look at the following documentation for expanding matrices:

https://in.mathworks.com/help/matlab/math/creating-and-concatenating-matrices.html#:~:text=You%20can%20add%20one%20or,(3%2C4)%20position.

You can also take a look at this MATLAB answer:

https://in.mathworks.com/matlabcentral/answers/113813-append-rows-at-the-end-of-matrix

Hope this helps!

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