How to find sum of neighbor values in 2d array of any index

#1

how to find sum of neighbor values in 2d array of any index`
7 0 4
0 8 3
12 6 0
ex for 8 it is (7+4+3+6+12)

#2

simply
a(i-1)(j-1) + a(i)(j-1) + a(i-1)(j) + a(i+1)(j+1) + a(i)(j+1) + a(i+1)(j)
i hope its cleared if yes dont forget to mark it as resolved @guptanikhil898 :smiley:

#3

i am not asking about only mid one i want for all element it cab be at ends so i want ageneral one it will not work for index like i=0 j=0

#4

@guptanikhil898 just check if index exists or not like when you are calculating i-1 , j check if i-1 greater than eq 0 then only take it in sum

#5

this way for 0,0 automatically 0 1 , 1 0 , 1 1 will be checked others will be discarded

#6

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