How to save the result of each loop separately

Question

Olayinka 2023-11-21

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https://ww2.mathworks.cn/matlabcentral/answers/2050307-how-to-save-the-result-of-each-loop-separately

回答： Mathieu NOE 2023-11-21

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.

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Answer 1

Paul 2023-11-21

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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.

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Answer 2

Les Beckham 2023-11-21

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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}

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Answer 3

Mathieu NOE 2023-11-21

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在 MATLAB Online 中打开

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]}