How to flip only some rows inside a matrix?

Question

Muniba Shah 2018-10-27

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/426444-how-to-flip-only-some-rows-inside-a-matrix

评论： madhan ravi 2018-10-31

采纳的回答： madhan ravi

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hey all, if i have vector

A=[2 5 6 7 8 9]

i need it to become a matrix

A=[2 9;
   5 8;
   7 6]

any suggestions?

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the cyclist 2018-10-27

I don't understand the general rule for going from the vector to the matrix. Can you describe it?

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Answer 1

madhan ravi 2018-10-27

2
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https://ww2.mathworks.cn/matlabcentral/answers/426444-how-to-flip-only-some-rows-inside-a-matrix#answer_343762

在 MATLAB Online 中打开

A=[2 5 6 7 8 9]
a=fliplr(reshape(A,[3 2]))
a([3 1])= a([1 3])
a=fliplr([a(1:2,:);flip(a(3,:))])

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Abdul Rehman 2018-10-27

编辑：Abdul Rehman 2018-10-27

that good one Madhan Sir.

madhan ravi 2018-10-31

Thank you @Abdul

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Answer 2

Abdul Rehman 2018-10-27

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https://ww2.mathworks.cn/matlabcentral/answers/426444-how-to-flip-only-some-rows-inside-a-matrix#answer_343763

编辑：Abdul Rehman 2018-10-27

在 MATLAB Online 中打开

i have got Answer for you but its not generic for all matrix.you should look for the end and first element of matrix.

Hopefully it's work for you...

if true
 A=[2 5 6 7 8 9];
 b=(size(A));
 [r c]=size(A);
 j=1;
 gg=c;
 for u=c:-1:c-1 %two iteration for size of vector.
 if(j==1)
  b(j)=A(j); % first value at start 
 end
 if(gg==c)
   b(gg)=A(gg/2); %Size of vector divided by 2 center value at end 
 end
  j=j+1;
  b(j)=A(u);
  b(j+1)=A(j);
  j=j+1;
  end
  b=reshape(b,[2 3])