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]

A = 4

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

Solve

Last solution submitted on Jul 11, 2019

goc3 on 24 Feb 2017

Additional test cases have been added.

William Katzianer on 11 Aug 2018

nice way to learn about matrix concatenation

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