MATLAB: Remove rows in a matrix not having same element

Question

I am having a matrix

A =[1 2 3;

1 2 6;

1 2 7;

1 3 6;

1 3 7;

1 6 7;

2 3 6;

2 3 7;

2 6 7;

3 6 7]

I need the rows having element 2 means final matrix should be

A =[1 2 3;

1 2 6;

1 2 7;

2 3 6;

2 3 7;

2 6 7]

Answer 1

This should work

Loc = ismember(A, 2)
idx = any(Loc,2)
B = A(idx, :)