How do I swap 2 rows of a cell array?

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Pietro Fedrizzi 2021-10-21

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https://ww2.mathworks.cn/matlabcentral/answers/1568853-how-do-i-swap-2-rows-of-a-cell-array

评论： dpb 2021-10-21

I have a 3x2 cell array and I need to swap row 2 and row 3. How can I solve this simple problem? Is there a function to do so that I don't know?

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dpb 2021-10-21

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https://ww2.mathworks.cn/matlabcentral/answers/1568853-how-do-i-swap-2-rows-of-a-cell-array#answer_813523

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One way...

>> C=num2cell(randi(10,3,2))
C =
  3×2 cell array
    {[5]}    {[1]}
    {[9]}    {[5]}
    {[6]}    {[5]}
>> C(2:3,:)=flipud(C(2:3,:))
C =
  3×2 cell array
    {[5]}    {[1]}
    {[6]}    {[5]}
    {[9]}    {[5]}
>> 

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Bruno Luong 2021-10-21

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"Change the indices to 2 and 4 (presuming at least four rows in the array, of course) and they don't do the same thing at all."

??? I just don't know what your are trying to say here. They do the same thing to my book

C=num2cell(randi(10,5,2))
C = 5×2 cell array
    {[ 1]}    {[6]}
    {[ 1]}    {[4]}
    {[ 6]}    {[2]}
    {[ 3]}    {[8]}
    {[10]}    {[4]}
Corg = C;
% dpb method
C([2 4],:)=flipud(C([2 4],:))
C = 5×2 cell array
    {[ 1]}    {[6]}
    {[ 3]}    {[8]}
    {[ 6]}    {[2]}
    {[ 1]}    {[4]}
    {[10]}    {[4]}
C=Corg;
% Bruno method
C([2 4],:)=C([4 2],:)
C = 5×2 cell array
    {[ 1]}    {[6]}
    {[ 3]}    {[8]}
    {[ 6]}    {[2]}
    {[ 1]}    {[4]}
    {[10]}    {[4]}

dpb 2021-10-21

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You wrote above

% dpb method
C([2 4],:)=flipud(C([2 4],:))

but that is NOT the code I wrote; you elided the colon that selects contiguous rows.

What I actually wrote in the original answer was

C([2:3],:)=flipud(C([2:3],:));

So, when change the 3 to a 4 one will get 3 rows instead of just two because I assumed (given the OP's example) there could be a more general case of wanting more than just two rows.

You just missed seeing the other colon, Bruno...

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