how to pad the matrix with ones?

i want to padded the input matixe of any row and colum with one

for eaxmple if i take input matrix A

A = 1 2 3

4 5 6

7 8 9

then padden one should be

A = 1 1 1 1 1

1 1 2 3 1

1 4 5 6 1

1 7 8 9 1

1 1 1 1 1

for it is there is any command or if not then what will be the code

Answer 1

[Walter Roberson]

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

A = 3×3

1 2 3 4 5 6 7 8 9

B = padarray(A, [1 1], 1)

B = 5×5

1 1 1 1 1 1 1 2 3 1 1 4 5 6 1 1 7 8 9 1 1 1 1 1 1