Storing Multiple Matrices from a For Loop
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How do I index and store multiple matrices as a run through a for loop? For instance, I generate a 10x10 matrix the first time through and I want to store this result for access later before proceeding to the next matrix generation.
采纳的回答
You can use a cell array, e.g
n = 10 ;
M = cell(n, 1) ;
for k = 1 : n
M{k} = 20*k + rand(10) ;
end
you can see that each
M{1}, M{2}, etc
is a the 10x10 matrix defined at a specific iteration of the loop.
Note the difference between regular block indexing with () and accessing cells content with {}:
M(1)
is cell #1 of the cell array M, whereas
M{1}
is the content of cell #1 (in the present case, it is a 10x10 matrix).
15 个评论
Anthony Uwaechia
2015-8-17
this is actually an intelligent way of saving matrix from loop iterations. thanks a lot. it really solved my problem
Swathi Chandrasekar
2017-5-9
Amazing.Thanks
Alvina Khairun Nisa
2017-5-23
Can I save m{k} to .mat file?
Stephen23
2017-5-23
@Alvina Khairun Nisa: allocate it to a temporary variable and save that, e.g.:
for k = 1:N
data = m{k};
fnm = sprintf('file_%d.mat',k);
save(fnm,'data');
end
Irfan Azhar
2018-1-2
very helpful. thanks indeed.
Mohammad Kifayath Chowdhury
2019-7-4
Thanks a lot.
Redouane Bouchou
2020-4-7
thank you , that was very helpfeul
Himanshu Banait
2020-7-13
Thanks a lot.
Malik haseeb Haider
2020-12-8
many thanks
mary john
2020-12-31
thanks a lot
Marcio Pereira
2021-3-21
Very good! Grateful!
Lukas Leitenbacher
2021-11-29
You´re the real MVP, man! Thx a lot for this approach!
Ali Berenjian
2022-4-3
thanks a lot!
Bryan Guilcapi
2022-7-20
Hi, i have a question, is possible to plot all this cell in one plot calling the data that are inside of the cell?
Walid
2023-7-22
thank you
更多回答（2 个）
Saeed Bello
2017-8-7
You can use a three-dimensional matrix e.g.
for i = 1:8 % no. of iteration
S(:, :, i) = myfunx(i,10); % 10 x 10 output
end
Then you can access each iteration by calling S(:, : , 1) or S(:, : , 2) or S(:, : , 3) and so on. Source:https://stackoverflow.com/questions/30036908/output-of-for-loop-as-a-matrix-matlab
3 个评论
Irfan Azhar
2018-1-2
many thanks indeed.
ELIAS PERATICOS
2018-4-27
Saeed Bello, thanks a lot this was very useful.
rees adah
2018-10-31
I also have a similar problem but this solution didn't work for me.i intend to store the matrices coming from a nested for loop into a multidimensional array and reference it later...how do I do that please?
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