How to delete a duplicate cells?

Question

NHJ 2022-8-11

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1777780-how-to-delete-a-duplicate-cells

评论： NHJ 2022-8-11

How to delete a duplicate cells? For example I have 1x4 cells and some cell have the same value. I want to delete the cell, so that my output cell will become smaller.

%Create cell in a cell.
F = {1, 2, 3, 4}
F{1,1} = [3 8;6 4]
F{1,2} = [6 9;7 3]
F{1,3} = [3 8;6 4]
F{1,4} = [6 9;7 3]
%Delete duplicate cells
Z = unique(F)

I get an error because the function unique only can be used with a vector. Suppose the output only have cell F{1,1} and F{1,2}.

How to do that? Thanks in advance

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Answer 1

Stephen23 2022-8-11

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1777780-how-to-delete-a-duplicate-cells#answer_1024905

编辑：Stephen23 2022-8-11

在 MATLAB Online 中打开

F = {[3,8;6,4],[6,9;7,3],[3,8;6,4],[6,9;7,3]};
F{:}
ans = 2×2
     3     8
     6     4
ans = 2×2
     6     9
     7     3
ans = 2×2
     3     8
     6     4
ans = 2×2
     6     9
     7     3
for ii = numel(F):-1:2
    for jj = 1:ii-1
        if isequal(F{ii},F{jj})
            F(ii) = [];
            break
        end
    end
end
F{:}
ans = 2×2
     3     8
     6     4
ans = 2×2
     6     9
     7     3

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NHJ 2022-8-11

Thank you, this is what I try to do. One more thing, if the value in the cells have a negative sign (negative values), how to ignore the sign? I want it to compare the values only. For example F = {[3,8;6,4],[6,9;7,3],[-3,-8;6,4],[6,-9;7,3]}. Thak you in advance

NHJ 2022-8-11

在 MATLAB Online 中打开

I add abs function in the code to have only positive value and I get what I want.

for ii = numel(F):-1:2
    for jj = 1:ii-1
        if isequal(abs(F{ii}),abs(F{jj}))
            F(ii) = [];
            break
        end
    end
end
F{:}