How do a cell2mat conversion for a non-uniform cell to a matrix

Question

Cutie 2021-9-22

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1458159-how-do-a-cell2mat-conversion-for-a-non-uniform-cell-to-a-matrix

评论： Cutie 2021-9-28

采纳的回答： Simon Chan

Data_In_Cell.mat

在 MATLAB Online 中打开

I have a 1 x 10 cell with Non-uniform data in each cell array.
How do a cell2mat conversion without losing any of the element.
The output i want is such that the content of each of the cell is made a row vector with the subsequent cells 'concatenate' next to it in the order they appear in the cell array, i.e number of row of the matrix is equal to the max(length) while others are zero padded and the number of column is equal to number of column of the cell array. As in the example where the cell is 1x10, the result cell2mat matrix should be x-row by 10 column.

The shape looks like:

DD = {3401×1 double} {3601×1 double} {8081×1 double} {4041×1 double} {8721×1 double} {4281×1 double}

{5521×1 double} {4041×1 double} {4881×1 double} {5761×1 double}

From the above, the number of row in cell each array is different but I want an output that will covert the cell to a matrix.

Desire output

DD_matrix = 8721-row by 10-column (8721 being the cell with largest row number, others that follow should be zero padded)

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Answer 1

Simon Chan 2021-9-22

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https://ww2.mathworks.cn/matlabcentral/answers/1458159-how-do-a-cell2mat-conversion-for-a-non-uniform-cell-to-a-matrix#answer_792449

在 MATLAB Online 中打开

Do it in several steps as follows:

idx.size = cellfun(@length,DD);
idx.padded = max(idx.size)-idx.size;
DDpadded = cellfun(@(x,y) [x;zeros(y,1)],DD,num2cell(idx.padded),'uni',0);
DD_matrix = cell2mat(DDpadded);

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Simon Chan 2021-9-28

You may refer to the MATLAB documentation about function cellfun.

In your case, there are two input arguments which are variable DD and num2cell(idx.padded).

So x and y are referring to variable DD and num2cell(idx.padded) respectively.

Cutie 2021-9-28

Thank you so much @Simon Chan

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Answer 2

Matt J 2021-9-22

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https://ww2.mathworks.cn/matlabcentral/answers/1458159-how-do-a-cell2mat-conversion-for-a-non-uniform-cell-to-a-matrix#answer_792364

在 MATLAB Online 中打开

cell2mat(DD(:))

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Cutie 2021-9-22

编辑：Cutie 2021-9-22

Thank you @Matt J but this is not the output that I want.

The output i want is such that the content of each of the cell is made a row vector with the subsequent cells 'concatenate' next to it in the order they appear in the cell array, i.e number of row of the matrix is equal to the max(length) while others are zero padded and the number of column is equal to number of column of the cell array. As in the example where the cell is 1x10, the result cell2mat matrix should be x-row by 10 column.

The shape looks like:

DD = {3401×1 double} {3601×1 double} {8081×1 double} {4041×1 double} {8721×1 double} {4281×1 double}

{5521×1 double} {4041×1 double} {4881×1 double} {5761×1 double}

From the above, the number of row in cell each array is different but I want an output that will covert the cell to a matrix.

Desire output

DD_matrix = 8721-row by 10-column (8721 being the cell with largest row number, others that follow should be zero padded)

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