Renumber matrix with some restrictions

Question

Antonis Ventouris 2022-1-5

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https://ww2.mathworks.cn/matlabcentral/answers/1622720-renumber-matrix-with-some-restrictions

评论： Antonis Ventouris 2022-1-5

采纳的回答： Walter Roberson

Hello everyone,

i have a problem with a matrix called conn which represents the names of some cordinates.

The conn matrix is: conn=[1 5; 5 6; 6 7; 7 2; 2 3; 2 8; 8 9 ; 9 10; 10 4]

i want to renumber it from the start so the new matrix Con would be:

Con = [1 2; 2 3; 3 4; 4 5; 5 6; 5 7; 7 8 ; 8 9; 9 10].

So i want to renumber it from start row by row but all the same numbers from conn matrix apprear in the Con with the same number (see 2 3 and 2 8 from conn). Is it possible?

Thanks in advance.

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Answer 1

Walter Roberson 2022-1-5

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https://ww2.mathworks.cn/matlabcentral/answers/1622720-renumber-matrix-with-some-restrictions#answer_868525

编辑：Walter Roberson 2022-1-5

在 MATLAB Online 中打开

conn=[1 5; 5 6; 6 7; 7 2; 2 3; 2 8; 8 9 ; 9 10; 10 4]
conn = 9×2
     1     5
     5     6
     6     7
     7     2
     2     3
     2     8
     8     9
     9    10
    10     4
[~, ~, ic] = unique(conn.', 'stable')
ic = 18×1
     1
     2
     2
     3
     3
     4
     4
     5
     5
     6
Con = reshape(ic, 2, []).'
Con = 9×2
     1     2
     2     3
     3     4
     4     5
     5     6
     5     7
     7     8
     8     9
     9    10

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Antonis Ventouris 2022-1-5

you are a star! thank you!

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Answer 2

Steven Lord 2022-1-5

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在 MATLAB Online 中打开

I'm not completely sure how you got from conn to Con, in particular I'm not sure how you generated the third row in Con. [3 4] doesn't appear as a row in conn. What I think from your description you want uses sort and sortrows.

conn=[1 5; 5 6; 6 7; 7 2; 2 3; 2 8; 8 9 ; 9 10; 10 4]
conn = 9×2
   5
   6
   7
   2
   3
   8
   9
  10
   4
smallerNumbersFirstInRow = sort(conn, 2)
smallerNumbersFirstInRow = 9×2
   5
   6
   7
   7
   3
   8
   9
  10
  10
Con = sortrows(smallerNumbersFirstInRow)
Con = 9×2
   5
   3
   7
   8
  10
   6
   7
   9
  10