# how to batch save and load loop variable

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peter huang on 19 Jun 2022
Commented: Stephen23 on 19 Jun 2022
Hello, everyone
I want to access the result of each calculation in the loop calculation I would like to ask if MATLAB has any instructions for batch storage and batch input of variables? and I want to make each stored variable have a different name
ex code
for i = 1:3
a = rand(1,10)
end
a =
0.5817 0.5337 0.8386 0.3502 0.3441 0.9860 0.8664 0.5777 0.2776 0.2758
a =
0.2768 0.5556 0.1333 0.3556 0.8931 0.9569 0.0273 0.2038 0.2547 0.7161
a =
0.2658 0.2586 0.4210 0.5831 0.6447 0.0349 0.2437 0.3171 0.3266 0.4875
I want to convert each generated a into a mat file and be able to read these three sets of a to matlab
Because using normal access will be overwritten because the name is all a
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Stephen23 on 19 Jun 2022
"Because using normal access will be overwritten because the name is all a"
Only if you write code that overwrites that variable.
"I want to make each stored variable have a different name"
That would be a very complex and inefficient approach, whereas you could just use simple and efficient indexing.
What is stopping you from using basic indexing?

KALYAN ACHARJYA on 19 Jun 2022
Edited: KALYAN ACHARJYA on 19 Jun 2022
#Cell Array cell
a=cell(1,3);
for i = 1:3
a{i}=rand(1,10)
end
Once strore in the cell array, you can do/access data in easiest & efficient way.

Voss on 19 Jun 2022
How about making a a matrix?
a = zeros(3,10);
for i = 1:3
a(i,:) = rand(1,10);
end
disp(a);
0.6037 0.8371 0.3572 0.1454 0.0825 0.5461 0.5211 0.5553 0.2386 0.9297 0.6848 0.8260 0.3338 0.5792 0.9571 0.5220 0.1013 0.0640 0.6952 0.6487 0.6763 0.6561 0.1229 0.5876 0.1097 0.0735 0.6933 0.0960 0.8610 0.0459
Or, if each iteration produces a vector of a different length, make a a cell array:
a = cell(3,1);
for i = 1:3
a{i} = rand(1,randi(10));
end
disp(a);
{[ 0.0980 0.9935]} {[0.9495 0.0781 0.8634 0.3343 0.1644 0.7231 0.6781 0.6991 0.4505]} {[ 0.9395 0.4197 0.9975 0.2326 0.2881 0.4256 0.7652]}
There is no need to make several variables; use one variable (matrix, cell array, etc.) and index into that.