How do I print a given martix in a spiral matrix scan order but the start from any element as user defined?

if i have this matrix : Input:

1 2 3 4

5 6 7 8

9 10 11 12

13 14 15 16

I need display it in sipral matrix order as this output:

1 5 9 13 14 15 16 12 8 4 3 2 6 10 11 7

but in this example start from position(1,1) i need to implement code with userdefined start poit like from (2,2) or any point. Then i need make reverse operation to get the original matrix

1 2 3 4

5 6 7 8

9 10 11 12

13 14 15 16

Answer 1

[KSSV]

This might help you:

https://in.mathworks.com/matlabcentral/answers/466188-how-do-i-generate-a-spiral-matrix-which-starts-from-first-element

[Arshub]

@KSI need output as a vector .