Select repeating elements in an matrix

2021 6 3
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I have this matrix:
1 44
1 24
2 56
1 26
2 51
2 56
I want to select all rows whose first column is a one.
That is, I want to get an array:
1 44
1 24
1 26
and on the other hand:
2 56
2 51
2 56
Thank you very much for the help

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1 个投票

A = [???] % Your data
B = A(A(:,1)==1, :)
Good luck

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