Divide every entry of a column by the same number

Suppose I have

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

and I want to divide every entry in the second column by 2 so the answer is

B = [1 1 3; 4 2.5 6; 7 4 9];

What will be a compact way of doing this?

Answer 1

[Birdman]

 A(:,2)=A(:,2)./2;
 B=A

[Walter Roberson]

Anish Thakur comments

Didn't work

[Walter Roberson]

Anish Thakur:

It does work. But the code above has the side effect of changing A as well. A small modification avoids that:

B=A;
B(:,2)=B(:,2)./2;