how to assign numbers to each row of a matrix? knowing that my matrix is 70x4 so that each row has an index from 1 to 70. Thank's

antennaSubset =

     1     2     3     4
     1     2     3     5
     1     2     3     6
     1     2     3     7
     1     2     3     8
     1     2     4     5
     1     2     4     6
     1     2     4     7
     1     2     4     8
     1     2     5     6
     1     2     5     7
     1     2     5     8
     1     2     6     7
     1     2     6     8
     1     2     7     8
     1     3     4     5
     1     3     4     6
     1     3     4     7
     1     3     4     8
     1     3     5     6
     1     3     5     7
     1     3     5     8
     1     3     6     7
     1     3     6     8
     1     3     7     8
     1     4     5     6
     1     4     5     7
     1     4     5     8
     1     4     6     7
     1     4     6     8
     1     4     7     8
     1     5     6     7
     1     5     6     8
     1     5     7     8
     1     6     7     8
     2     3     4     5
     2     3     4     6
     2     3     4     7
     2     3     4     8
     2     3     5     6
     2     3     5     7
     2     3     5     8
     2     3     6     7
     2     3     6     8
     2     3     7     8
     2     4     5     6
     2     4     5     7
     2     4     5     8
     2     4     6     7
     2     4     6     8
     2     4     7     8
     2     5     6     7
     2     5     6     8
     2     5     7     8
     2     6     7     8
     3     4     5     6
     3     4     5     7
     3     4     5     8
     3     4     6     7
     3     4     6     8
     3     4     7     8
     3     5     6     7
     3     5     6     8
     3     5     7     8
     3     6     7     8
     4     5     6     7
     4     5     6     8
     4     5     7     8
     4     6     7     8
     5     6     7     8

Answer 1

[Steven Lord]

You already have, by storing your data in a matrix.

A = magic(5)

A = 5×5

17 24 1 8 15 23 5 7 14 16 4 6 13 20 22 10 12 19 21 3 11 18 25 2 9

% Data associated with the number 3
A(3, :)

ans = 1×5

4 6 13 20 22

If you have different requirements for your numbering that the row indices do not satisfy, please state those requirements.

[RT Student]

no there is no requirement, it is simply numbering the 70 lines that I have with an index for each line.

Juste like this :

(I need these indexes to indicate for example the elements of a line instead of writing them)

Index:          Array: 
1               1 2 3 4 
2               1 3 6 8
3               2 4 1 4
.                 ...
.                 ...
70              5 3 2 1

[RT Student]

for exemple if I call index 2 the resulte is [1 3 6 8]

[dpb]

That's what the row index into the array does for you -- you don't need to save a variable 1:N.

Only if there were something other than a 1:1 correlation in the storage order would you have to look up the index value -- but then it would be a matching operation like find(x(:,1)==2) instead of just a straight index operation.

[RT Student]

Yes that's exactly it, the same indexes that there are in the array of the variable, except that when I call this matrix in the command windows I find that my matrix without index. I searched and found the command 'countEachLabel' but it does not work

[Steven Lord]

So you want to display the array with row indices beside each row? You don't want to somehow include those row indices as part of the data in the array?

[RT Student]

yes line indices next to each line but it is also necessary that when I use a line I can see which index corresponds to it and vice versa .

I hope to be clear

[Scott MacKenzie]

Yes. Something like this will show you both the index (or line number, as you say) and the contents of the line:

>> A = magic(5)
A =
    17    24     1     8    15
    23     5     7    14    16
     4     6    13    20    22
    10    12    19    21     3
    11    18    25     2     9

>> idx = 3
idx =
     3

>> [idx A(idx,:)]
ans =
     3     4     6    13    20    22

[RT Student]

Yes like this , but if I want to show matrix A all index in the left must appear .

Thank you for you answer sir.

[Scott MacKenzie]

Yes, this is doable. To show the entire matrix with the line number (row index) shown first on each line:

>> n = 5;
>> A = magic(n);
>> [(1:n)' A]

ans =

     1    17    24     1     8    15
     2    23     5     7    14    16
     3     4     6    13    20    22
     4    10    12    19    21     3
     5    11    18    25     2     9

[RT Student]

Thank you !