how to sum two-dimensional arrays

[ozzyhijo]

Hi iam kind of confused in how to sum a two dimensional arrays. I think i need some help;

(array[i][j]+sum of the four surronding numbers)/5>6

Im working with a two dimensional array [20][20]
please some hints!!!

[Breadman]

array[i][j] + array[i+1][j] + array[i+1][j+1] + array[i-1][j-1]...etc;

just make sure i and j wont get over 20 or less than 0