cell array for loop assignment

Question

Wang Jack 2020-5-12

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/524907-cell-array-for-loop-assignment

评论： Dyuman Joshi 2023-11-14

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Here is some code

A1 is a 1*4cell array, I want got a 2*4 cell array, but non of those statement can do,

all I got is nesting cell array

anyone any idear?

A2={};
A1={rand(10,2),rand(10,2),rand(10,2),rand(10,2);}
for i=1:4
    A2={A2;mat2cell(A{i},[5,5],2)};
    A3{i}=mat2cell(A{i},[5,5],2);
    A4{:,i}=mat2cell(A{i},[5,5],2);
    A5{1,i}=mat2cell(A{i},[5,5],2);
end

A2={};
 A={rand(10,2),rand(10,2),rand(10,2),rand(10,2),};
 for i=1:4
    A2={A2;mat2cell(A{i},[5,5])};
    A3{i}=mat2cell(A{i},[5,5]);
    A4{:,i}=mat2cell(A{i},[5,5]);
    A5{1,i}=mat2cell(A{i},[5,5]);
 end

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Prateek Rai 2020-6-18

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As per my understanding, you are having a 1*4 cell array from which you want to get 2*4 cell array

You can do this by the following sample code :

Here is a sample code :

A2=cell(2,4); 
A={rand(10,2),rand(10,2),rand(10,2),rand(10,2);} 
for i=1:4 
    A2{1,i}=A{i}; 
    A2{2,i}=[5,5]; % fill the data of your interest in new column 
end 

You can refer to the following documentation for more details .

https://www.mathworks.com/help/matlab/ref/cell.html

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Answer 1

Voss 2023-11-14

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A = {rand(10,2),rand(10,2),rand(10,2),rand(10,2)}
A = 1×4 cell array
    {10×2 double}    {10×2 double}    {10×2 double}    {10×2 double}
nA = numel(A);
result = cell(2,nA);
for ii = 1:nA
    result(:,ii) = {A{ii}(1:end/2,:); A{ii}(end/2+1:end,:)};
end
disp(result);
    {5×2 double}    {5×2 double}    {5×2 double}    {5×2 double}
    {5×2 double}    {5×2 double}    {5×2 double}    {5×2 double}

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Dyuman Joshi 2023-11-14

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An approach without loops -

A = {rand(10,2),rand(10,2),rand(10,2),rand(10,2)}
A = 1×4 cell array
    {10×2 double}    {10×2 double}    {10×2 double}    {10×2 double}
B = horzcat(A{:})
B = 10×8
    0.1565    0.9521    0.7572    0.6869    0.7378    0.4813    0.8155    0.1594
    0.2282    0.4625    0.9511    0.7689    0.4404    0.3185    0.4336    0.3613
    0.6424    0.8441    0.7075    0.3435    0.3700    0.1041    0.1690    0.1084
    0.6138    0.8827    0.8309    0.5593    0.5412    0.0326    0.1012    0.4879
    0.1479    0.5416    0.4597    0.4603    0.7875    0.3722    0.5623    0.9909
    0.4484    0.7419    0.6389    0.5388    0.0598    0.4542    0.5955    0.8836
    0.2918    0.5863    0.5799    0.5679    0.5118    0.8944    0.6441    0.8400
    0.0530    0.5036    0.4431    0.2935    0.1843    0.4312    0.3931    0.4805
    0.3789    0.1006    0.3056    0.5012    0.3816    0.1229    0.2707    0.2895
    0.2958    0.3525    0.5879    0.4889    0.8968    0.5852    0.2676    0.3825
C = mat2cell(B, [5 5], [2 2 2 2])
C = 2×4 cell array
    {5×2 double}    {5×2 double}    {5×2 double}    {5×2 double}
    {5×2 double}    {5×2 double}    {5×2 double}    {5×2 double}
%For verification
C{1}
ans = 5×2
    0.1565    0.9521
    0.2282    0.4625
    0.6424    0.8441
    0.6138    0.8827
    0.1479    0.5416