MATLAB: Find dublicated value in a column and return the whole row

Question

imagine I have this:

A = [ 1 ; 3 ; 5 ; 6 ; 9 ]

and

B = [ 1 4 ; 2 7 ; 3 5 ; 9 10 ]

I need to end up with:

C = [ 1 4 ; 3 5 ; 9 10 ]

In B(:,1) column I need to find those from A that match, and if so, return the full rows of B. Hope I am clear

Answer 1

A = [ 1 ; 3 ; 5 ; 6 ; 9 ]
B = [ 1 4 ; 2 7 ; 3 5 ; 9 10 ]
idx=ismember(B(:,1),A)
C = B(idx,:)