How to create palindromic matrix by array ?

Question

I have array contain nxn element type int , and i know it is palindromic matrix , and problem is how to create output is palindromic matrix !
input : 1 1 1 1 1 3 3 3 3
output : 1 3 1
3 1 3
1 3 1

Answer 1

Create groups of 8, 4 and a group of 1 element if it is an odd number. Then populate the matrix.

Answer 2

Once you have the groups you may populate the topleft corner of the matrix. The center is from group 1 if odd, the axis from group of 4 and 8, the rest from 8.
When ready copy it properly to the other three quarters.

Answer 3

ok i understand ! thank u so much .

Answer 4

thanks , but I need sort element to output ! not check again it right .