MATLAB: Delete rows from matrix that contain values that correspond to values from a separate variable vector

Question

Hi,

I wish to remove rows from a matrix A [n x 2] that contains any value from another vector B [1 x n] in its first column. The values in vector B change depending on my problem, I am therefore looking for a solution that can read the values in the B vector and apply the modification automatically to the A matrix.

An example B vector is shown below:

 B = [2, 3, 5, 8, 10]

Along with an example A matrix:

 A = [ 1 2;
       2 3; 
       2 4; 
       3 1; 
       3 4; 
       4 2;
       4 9;
       5 1;
       5 7;
       6 2;
       6 3;
       6 4;
       8 2;
       8 9;
       9 1;
       9 6;
       10 6]

The desired output matrix Z [n x 2] would be as follows:

 Z = [ 1 2; 
       4 2;
       4 9;
       6 2;
       6 3;
       6 4;
       9 1;
       9 6]

Any help would be appreciated. I am using this solution as part of a meshing algorithm that I am developing, where matrix Z forms the connectivity between nodes.

Thanks in advance, Sam

Answer 1

Z=A(~ismember(A(:,1),B),:)