With a given matrix A (size m x n) create a matrix B (size m+2 x n+2) so that the matrix A is surrounded by ones:

A = [1 2 3
     3 2 1]

B = [1 1 1 1 1
     1 1 2 3 1
     1 3 2 1 1
     1 1 1 1 1]

or

A = 4

B = [ 1 1 1
      1 4 1
      1 1 1]
Solve

Solution Stats

3980 Solutions

1451 Solvers

Last Solution submitted on Mar 04, 2026

Last 200 Solutions

Problem Comments

Solution Comments

Show comments

Problem Recent Solvers1451

Thilanka Udara bao Lorenzo Hanyang

Suggested Problems

More from this Author9

Problem Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!