CODEWITHSUNDEEP
matlabmatrix
Nima Alidoust
Nima Alidoust

Reputation: 55

How can I remove the row of an mx3 matrix from an nx3 matrix (n>m)?

In matlab, If an m by 3 matrix has rows that all exist in a bigger n by 3 matrix, how can I create a (n-m) by 3 matrix that does not contain the rows of the first (m by 3) matrix?

e.g. if the first matrix is [1 4 6] and the second matrix [1 2 3; 1 4 6; 8 7 4], how can I come up with the matrix: [1 2 3;8 7 4]?

Upvotes: 2

Views: 230

Answers (1)

Gunther Struyf
Gunther Struyf

Reputation: 11168

That's a job for ismember with the 'rows' option:

a = [1 4 6];
b = [1 2 3; 1 4 6; 8 7 4];

eq_rows = ismember(b,a,'rows');
result = b(~eq_rows,:)

Upvotes: 5

Related Questions