How can I add a column of data to a matrix

I have matrix A1=[1,2,3;4,5,6;7,8,9] and b1 = [10,11,12] and I want to add it to the end of matrix A1 so that A1's size will become 3x4 instead of 3x3

[Tyler S]

So the result of this would make A1=[1,2,3,10;4,5,6,11;7,8,9,12]

Answer 1

[David Hill]

A1=[A1;b1];

[Tyler S]

Thats adding a row if im not mistaken I need to add b to the end of A so it adds a new column

[David Hill]

A1=[A1,b1'];

Answer 2

[darova]

Try my solution

A = [A b(:)]