Duplicate borders

Question

I want to duplicate all the borders of my 2d array a few times so I get a coppy of all outside rows and cols next to them.
Example:
Original:    1     2    3    4
(4-4)          5     6    7    8
                9    10   11  12
                13  14   15  16
Output:    1     1      2       3     4     4
6-6          1     1      2       3     4     4
               5     5      6       7     8    8
               9     9     10     11    12   12
              13   13     14    15    16   16
              13   13     14    15    16   16
(In the middle of the output array you find the origingal array)
I need to get up to 6 kopies of the borders.
So 6 kopie col than the original array and again 6 kopie col.
Same for the rows.
(example has 1 kopie col than the original array and again 1 kopie col.)
Solved!
Go to Solution.

Answer 1

Indeed this does the job as in the example.
But I have a 2d array whit random numers as input.
I don't know what the value of the element will be.
What makes it a lot more difficult...
It also can be this:
Original:    10      23    133    44
(4-4)          58     16     37     80
                999    10    131    72
                13      54    50      56
Output:   
(6-6)         10    10    23    133    44   44
                10    10    23    133   44    44
                58    58    16     37    80    80
                999  999  10     131   72    72 
                13    13    54     50    56    56 
                13    13    54     50    56    56