Convert matrix to cell knowing the number of components to have in each cell

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Alejandro Fernández 2021-2-2

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https://ww2.mathworks.cn/matlabcentral/answers/734260-convert-matrix-to-cell-knowing-the-number-of-components-to-have-in-each-cell

评论： Alejandro Fernández 2021-2-2

Hi, does anyone know how I could go from the data matrix to cell A knowing that, in this case:

idx = [2;4;3];
data = rand(9,2);
data =
7922    0.3922
9595    0.6555
6557    0.1712
0357    0.7060
8491    0.0318
9340    0.2769
6787    0.0462
7577    0.0971
7431    0.8235

- The first component of A will be the idx(1) 2 first elements of data.

- The second component of A will be the idx(2) next 4 elements of the array data

- The third component of A will be the next idx(3) 3 elements of the array data

In this case:

A{1} = [0.7922,0.3922;0.9595,0.6555];
A{2} = [0.6557,0.1712;0.0357,0.7060;0.8491,0.0318;0.9340,0.2769];
A{3} = [0.6787,0.0462;0.7577,0.0971;0.7431,0.8235];

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Alejandro Fernández 2021-2-2

编辑：Alejandro Fernández 2021-2-2

在 MATLAB Online 中打开

Another option to do it (which I wouldn't know either) would be, for example, to make a matrix that, based on idx that creates as many ones as elements indicated by idx(1), as many twos as elements indicated by idx(2),... as many x's as elements indicated by idx(end), in this case:

idx = [2;4;3];
B = [1;1;2;2;2;2;3;3;3];

Then a loop could be made so that the different elements could be separated in the corresponding cells.

It's just an idea since, as I said, I wouldn't know how to solve it that way either.

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Answer 1

Stephen23 2021-2-2

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https://ww2.mathworks.cn/matlabcentral/answers/734260-convert-matrix-to-cell-knowing-the-number-of-components-to-have-in-each-cell#answer_613085

编辑：Stephen23 2021-2-2

在 MATLAB Online 中打开

idx = [2;4;3];
data = [
    0.7922    0.3922
    0.9595    0.6555
    0.6557    0.1712
    0.0357    0.7060
    0.8491    0.0318
    0.9340    0.2769
    0.6787    0.0462
    0.7577    0.0971
    0.7431    0.8235];
A = mat2cell(data,idx,2)
A = 3x1 cell array
    {2×2 double}
    {4×2 double}
    {3×2 double}
A{:}
ans = 2×2
    0.7922    0.3922
    0.9595    0.6555
ans = 4×2
    0.6557    0.1712
    0.0357    0.7060
    0.8491    0.0318
    0.9340    0.2769
ans = 3×2
    0.6787    0.0462
    0.7577    0.0971
    0.7431    0.8235