How to convert a 3x3xN matrix to a N element cell array?

Question

Alon Rozen 2016-11-21

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https://ww2.mathworks.cn/matlabcentral/answers/313258-how-to-convert-a-3x3xn-matrix-to-a-n-element-cell-array

评论： Alexandra Harkai 2016-11-21

Hi all,

I have a three dimension matrix of 3x3xN, where N is a large number. I want to convert it to a N elements cell array in which every cell i contains the 3x3 matrix in the i'th position. I tried to work it out using the functions 'mat2cell' and 'num2cell' but couldn't understand how to do it. I read the help for these two functions but it didn't help me.

Can it be done?

Thanks,

Alon

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Answer 1

Alexandra Harkai 2016-11-21

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https://ww2.mathworks.cn/matlabcentral/answers/313258-how-to-convert-a-3x3xn-matrix-to-a-n-element-cell-array#answer_244110

编辑：Alexandra Harkai 2016-11-21

在 MATLAB Online 中打开

% a is your 3*3*N array
c = mat2cell(a,3,3,ones(1,N));
c = c(:);

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Alon Rozen 2016-11-21

Thanks a lot! works like charm :) Wander why the help can't explain something like this...

Alexandra Harkai 2016-11-21

It does actually (ie. you first want something that contains 3*3*1 elements in each cell, so according to help you need to go for [3],[3],[1 1 ...]), but that doesn't mean one doesn't get it wrong for the first try. Trial an error :)

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Answer 2

KSSV 2016-11-21

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/313258-how-to-convert-a-3x3xn-matrix-to-a-n-element-cell-array#answer_244112

在 MATLAB Online 中打开

A = rand(3,3,100) ;
[m,n,t] = size(A) ;
iwant=mat2cell(A, m, n, ones(1,t));

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Alon Rozen 2016-11-21

Thanks a lot! It work of cousre. I just needed the last step in the answer above.

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