Problem 611. surrounded matrix

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

41.88% Correct | 58.12% Incorrect
Last Solution submitted on Jan 15, 2026

Problem Comments

Solution Comments

Show comments

Problem Recent Solvers1445

Suggested Problems

More from this Author9

Problem Tags

matrices

Community Treasure Hunt

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

Start Hunting!