Pairwise subtraction of rows in the same matrix

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Adedeji 2019-5-11

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https://ww2.mathworks.cn/matlabcentral/answers/461555-pairwise-subtraction-of-rows-in-the-same-matrix

编辑： David Goodmanson 2019-5-12

采纳的回答： madhan ravi

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Hello guys...

Please I have this code

How can I subtract each row from all other rows(R) ... like subtracting R1-R1; R1-R2, R1-R3... R1-Rn+1 AND

then R2-R1, R2-R3.... R2-Rn+1 for all the rows

A1 = [...
   0     1     1     1
   1     1     1     1
   1     1     1     1
   1     1     1     1
   1     1     1     1
   0     1     1     1
   0     1     0     1
   0     0     0     1
   1     1     1     1
   1     1     1     1
   1     1     1     1
   0     1     0     1
   0     1     0     1
   1     1     1     1
   1     1     1     1
   0     1     1     1
   0     1     1     1
   1     1     1     1
   1     1     1     1];

I need this urgently....

Thanks

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Adedeji 2019-5-12

It's not a homework but part of an ongoing project of mine

as I explained while replying to David's answer.

I wish to subtract each customers 5 attributes (The Columns) from the other customers'.

The rows are the customers

The columns are their 5 attributes.

Adedeji 2019-5-12

I have tried Diff()

but it's not giving me a pairwise subtraction across all possible combinations of rows there could be.

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采纳的回答

madhan ravi 2019-5-12

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https://ww2.mathworks.cn/matlabcentral/answers/461555-pairwise-subtraction-of-rows-in-the-same-matrix#answer_374567

编辑：madhan ravi 2019-5-12

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Aa= reshape(a',1,size(a,2),[])- a; % a your matrix , each page of Aa represents each row’s subtraction 
A=reshape(permute(Aa,[2,1,3]),size(a,2),[]).'

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madhan ravi 2019-5-12

编辑：madhan ravi 2019-5-12

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Wanted = bsxfun(@minus,reshape(D.',1,size(D,2),[]), D) % the reason was your using version prior to 2016b, that's why when you ask a question you should fill up the field "Release" thereby these kinds of misunderstandings can be avoided