# How to save the result of each loop separately

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Olayinka on 21 Nov 2023
Answered: Mathieu NOE on 21 Nov 2023
I want to create two variables which are matrices is zeros(3,2) and zeros(4,2)
y = [3 4];
for i=1:length(y)
x=zeros(y(i),2)
end
x = 3×2
0 0 0 0 0 0
x = 4×2
0 0 0 0 0 0 0 0
I dont want the second loop to overwrite the result of the first loop.

Paul on 21 Nov 2023
One option is to use a cell array to store dissimilar objects
y = [3 4];
for i=1:length(y)
x{i}=zeros(y(i),2)
end
x = 1×1 cell array
{3×2 double}
x = 1×2 cell array
{3×2 double} {4×2 double}
Though not shown here, x can be preallocated based on the number of elements in y.

Les Beckham on 21 Nov 2023
Perhaps this (using a cell array)?
y = [3 4];
for i = 1:length(y)
x{i} = zeros(y(i), 2)
end
x = 1×1 cell array
{3×2 double}
x = 1×2 cell array
{3×2 double} {4×2 double}

Mathieu NOE on 21 Nov 2023
hello
some solutions :
y = [3 4];
for k=1:length(y)
% solution 1 : store as cell array
x{k} =zeros(y(k),2);
% solution 2A : store as structure
s(k).data =zeros(y(k),2);
% solution 2B : another structure
t.data{k} =zeros(y(k),2);
end
x
x = 1×2 cell array
{3×2 double} {4×2 double}
s
s = 1×2 struct array with fields:
data
t
t = struct with fields:
data: {[3×2 double] [4×2 double]}