duplicate borders

[koekie]

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.)

[Javed_H]

Hi

A partial solution may be as shown below

[.aCe.]

There are many ways obviously, this is slightly long winded. But will do the job.

[koekie]

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 

[.aCe.]

The code I posted will still work for random numbers.

[jcarmody]

I'm thinking it looks like recursion, but I made this instead:

Note - the little For loops were the beginnings of a recursive solution that would work for 2D and 1D arrays.  I had Matrix and Array size and decrement primitives.

[koekie]

Thanks for you help guy (.aCe.,jcarmody )!
Both solutions work out!

[jcarmody · Accepted solution]

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@koekie wrote:

[...]

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.)

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Is this what you're looking for?

[koekie]

Yes indeed, that was what I need! 🙂

[jcarmody]

I'm curious about why you need this.  What's it for?