How do I remove any Column in a matrix

11 vues (au cours des 30 derniers jours)
Cutie
Cutie le 14 Jan 2021
Commenté : Cutie le 14 Jan 2021
Please what is wrong with this function. I want it to remove 'n' column form the matrix A
function B = column_removal(A,n)
A1= A(:,1:n-1) % Index from column 1 to column 'n-1'
A2 = A(:,n+1:end) % Index from column 'n+1' to the last co1umn
B = [A1 A2] % concatenate A1 & A2 by which the n column would have been removed
end
  4 commentaires
Mathieu NOE
Mathieu NOE le 14 Jan 2021
A(:, n) = [];
means that the 'n' th column has been flushed
Cutie
Cutie le 14 Jan 2021
Thank you, but how do I assign the above output to a variable.

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Réponse acceptée

Matt J
Matt J le 14 Jan 2021
Modifié(e) : Matt J le 14 Jan 2021
Nothing is wrong with the code you've posted, but it would be simpler to do,
B=A(:,[1:n-1,n+1:end]);
or, slightly less efficiently,
B=A;
B(:,n)=[];
  8 commentaires
Image Analyst
Image Analyst le 14 Jan 2021
And Walter of course!
You can accept the Answer below to give ercan "credit" for helping you in terms of "reputation points". Thanks in advance.
Cutie
Cutie le 14 Jan 2021
I wanted to but the 'Accept answer' is not there. That's why I voted it,

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Plus de réponses (1)

ercan duzgun
ercan duzgun le 14 Jan 2021
Dear Cutie,
Your MATLAB function already works fine. However, Matt J's solution is simpler.
I checked your MATLAB function by this example below, and I received the expected result.
X=[1 2 3 4 5 6; 10 20 30 40 5 60;100 200 300 400 500 600]
column_removal(X,3)
A1 =
1 2
10 20
100 200
A2 =
4 5 6
40 5 60
400 500 600
ans =
1 2 4 5 6
10 20 40 5 60
100 200 400 500 600

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