Add lines and rows around an array

Is there a simple way to add single lines and rows around an existing array, like a boundary box.

E.g.:

1 2 3 4

4 5 6 7

7 8 9 0

shoud go to:

11 11 11 11 11 11

11 1 2 3 4 11

11 4 5 6 7 11

11 7 8 9 0 11

11 11 11 11 11 11

I know that I can insert a line and row at position one, e.g. like here, and append a line and row at the end like here, but maybe there is a more efficient solution?

Answer 1

[Alan Meier]

c = rand(3,3) %an example

a = zeros(3+2,3+2)+11;

a(2:4,2:4)= c

[darova]

It works