how to create a KERNEL as TXT-file?

Question

Hi experts 😉

I want to apply a "focal statistics" tool ("focal range") to an DEM. In this context I would like to create a individual kernel matrix.
The only thing I know about that: the kernel has to be an txt-file. But how should this txt-file look exactly?
Let me specify, what I need:

- the kernel should be square, 7x7 cells
- the central pixel should calculate the RANGE (maximum-value minus minimum-value) of ONLY the edge-cells of the matrix

This picture may illustrate, what I mean...
[ATTACH=CONFIG]18506[/ATTACH]

I would be very grateful, if someone could help me! It would be ideal, if someone could send me an example-txt-file. 
Thanks in advance!
Kind regards,
Max

7x7_kernel.png

BrianBulla_0-1656952825725.png

MarcinGasior · Accepted Answer

Try this values for irregular neighbourhood file (txt file also included):
7 7
1 1 1 1 1 1 1
1 0 0 0 0 0 1
1 0 0 0 0 0 1
1 0 0 0 0 0 1
1 0 0 0 0 0 1
1 0 0 0 0 0 1
1 1 1 1 1 1 1

To apply RANGE, choose apropriate Statistics type in tool dialog.