# How can I save the results of a nested loop?

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Shahpour Turkian on 9 Sep 2022
I have two input matrices: qq and om
l = [0 0.05 0.1 0.15];
qq = perms(l).';
m = [0.01 0.001 0.0001 0.0002];
om = perms(m);
These inputs get fed in my Function which in return will output a 1-by4 output, so I created a 24-by-4 results
results = zeros(width(om), length(om)*length(qq));
for i=1:length(om)
for j=1:length(qq)
results(i,j) = Function(qq(:,j),om(i,:))
end
end
since the output of my function is 1-by-4, I can't save it in a 1-by-1 cell so I get:
I get: Unable to perform assignment because the size of the left side is 1-by-1 and the size of the right side is 1-by-4.
I also tried
[results(i,1) results(i,2) results(i,3) results(i,4)] = AA_BL_M(qq(:,j),om(i,:))
this seems to work but doesn't save the iterations:
results = AA_BL_M(qq(:,j),om(i,:))

Cris LaPierre on 9 Sep 2022
Note that your preallocation of results does not match the number of times your for loops will run. Keeping your for loops the way they are, your resutls variable will need to be of size (i,j,4) to capture your results (or a (i,j) cell array)
You could try this
results = zeros(length(om), length(qq),4);
...
results(i,j,:) = Function(qq(:,j),om(i,:))
or
results = cell(length(om), length(qq));
...
results{i,j} = Function(qq(:,j),om(i,:))
##### 1 CommentShowHide None
Shahpour Turkian on 9 Sep 2022
Thank you Cris!

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