How can I sort data in cells?

Question

Janna Hinchliff 2019-2-22

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/446434-how-can-i-sort-data-in-cells

编辑： Adam Danz 2019-2-24

I have some sets of data saved in a cell array, where each element in the cell array is another cell array containing 3 elements, i.e.

data = 1x6 cell array
    {1 x 3 cell}    {1 x 3 cell}    {1 x 3 cell}    {1 x 3 cell}    {1 x 3 cell}    {1 x 3 cell}

The 1x3 cells all contain 2 single numbers and one mxn data set. I want to sort the data by the second number in the data set -

dataovenparamcell{j}{2}

such that cells with the same value of the second number are grouped together. How could I do this?

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madhan ravi 2019-2-22

Please illustrate with an example.

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Answer 1

Adam Danz 2019-2-22

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/446434-how-can-i-sort-data-in-cells#answer_362273

编辑：Adam Danz 2019-2-24

在 MATLAB Online 中打开

This solution can be reduced two lines but I added a third so it's easier to understand. Fake data are created at the top.

% Create fake data
data = { 
    {6 5 rand(3,4)}, {0 2 rand(3,4)}, {1 1 rand(3,4)}, ...
    {9 4 rand(3,4)}, {3 3 rand(3,4)}, {1 6 rand(3,4)}
    };
% Pull out the 2nd numbers and put them into a vector
secondNumber = cell2mat(cellfun(@(x)x(2),data)); 
% determine the sorted index of the vector
[~, sortIdx] = sort(secondNumber); 
%Resort the data
dataSorted = data(sortIdx); 