deleting selective multiple rows from a data matrix

I want to delete rows of a matrix depending on some specific values of one of its columns. Say, if A=[1,2,3,1;5,6,7,2;9,10,11,3;13,14,15,4]; B=A(:,4);

I want to delete rows of A if B<2 and B>3, that is want the second and third rows of A.

I have tried A(B,:)=[] type commands, but failed.

Answer 1

[Thomas]

A(~(B<2|B>3),:)

[Rabeya]

Thanks!

Answer 2

[Leah]

couple of problems

B<2 & B>3

is always false you need to use a logical index to filter rows of A, B is not logical (all zeros and ones) these commands would work

    A(B==2 | B==3,:)
    A([2 3],:)
    A(logical([0 1 1 0 ]),:)