What should I do to add a new row and a new column to a matrix?

Just ad the title shows, I have a matrix, for example M with the size 3-by-4. The M is [1 2 3 4;5 6 7 8;1 2 3 4]

What should I do if i want to get another matrix ,N like that: [0 0 0 0 0 0; 0 1 2 3 4 0; 0 5 6 7 8 0; 0 1 2 3 4 0; 0 0 0 0 0 0];

Answer 1

[Simon]

N = zeros(size(M)+2);
N(2:end-1, 2:end-1) = M;

Answer 2

[Andrei Bobrov]

if you have Image Processing Toolbox

N = padarray(M,[1 1]);