Effacer les filtres
Effacer les filtres

What is the easiest way to remove a vector from a matrix?

18 vues (au cours des 30 derniers jours)
Cantor Set
Cantor Set le 11 Sep 2021
Commenté : Chunru le 15 Sep 2021
Suppose there is a Loop A which returns a row vector y of the same number of columns such as matrix Q.
I want to remove all the occurrences of the row vectors y from Q, is their a simple way to do it (I am trying to avoid loops).
Here is a loop I wrote:
for i=1:size(Q,1)
s=eq(Q(i,:),y); r=all(s);
if r==1
Q(i,:)=[];
end
end

Réponses (2)

Chunru
Chunru le 11 Sep 2021
Modifié(e) : Chunru le 11 Sep 2021
a = magic(4);
a = [a; a(1, :); a]; % 1st 5th and 6th rows are the same
a
a = 9×4
16 2 3 13 5 11 10 8 9 7 6 12 4 14 15 1 16 2 3 13 16 2 3 13 5 11 10 8 9 7 6 12 4 14 15 1
y = a(1, :); % the vector input
idx = all(a == y, 2);
a(idx, :)=[]
a = 6×4
5 11 10 8 9 7 6 12 4 14 15 1 5 11 10 8 9 7 6 12 4 14 15 1
% in a line
% a(all(a==y, 2), :) =[]
  4 commentaires
TADA
TADA le 14 Sep 2021
this removes the lines that correspond to the indices in idx
Chunru
Chunru le 15 Sep 2021
@Chad Greene You don't have to replicate y (matlab does auto array expansion).

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TADA
TADA le 11 Sep 2021
A = [magic(5); magic(5)];
v = A(1,:);
mask = A==v;
eqRows = all(mask, 2);
A(eqRows, :) = [];

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