Renumber matrix with some restrictions

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Antonis Ventouris
Antonis Ventouris el 5 de En. de 2022
Comentada: Antonis Ventouris el 5 de En. de 2022
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.

Respuesta aceptada

Walter Roberson
Walter Roberson el 5 de En. de 2022
Editada: Walter Roberson el 5 de En. de 2022
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

Más respuestas (1)

Steven Lord
Steven Lord el 5 de En. de 2022
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
1 5 5 6 6 7 7 2 2 3 2 8 8 9 9 10 10 4
smallerNumbersFirstInRow = sort(conn, 2)
smallerNumbersFirstInRow = 9×2
1 5 5 6 6 7 2 7 2 3 2 8 8 9 9 10 4 10
Con = sortrows(smallerNumbersFirstInRow)
Con = 9×2
1 5 2 3 2 7 2 8 4 10 5 6 6 7 8 9 9 10
If that's not what you want can you describe in more detail exactly how you generated your Con matrix from the conn matrix?

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