How to complete this if-else statement for minesweeper.

% Step2: add the numbers to each bomb location based on number of bombs its
% touching
BoardFINAL = board;
for r = 1:1:row
    for c = 1:1:col
        if Board(r,c) ~= -1
            if r == 1 && c == 1
                AROUND = [Board(r,c+1),Board(r+1,c),Board(r+1,c+1)];
                BOMBcount = abs(sum(AROUND));
                BoardFINAL(r,c) = BOMBcount;
            elseif r == 1 && c == col
            elseif 
            elseif
            elseif r == 1
            elseif
            elseif 
            elseif
            else
                
                AROUND = [Board(r-1,c-1),Board(r-1,c),Board(r-1,c+1),Board(r,c-1),Board(r,c+1),Board(r+1,c-1),Board(r+1,c),Board(r+1,c+1)]
                BOMBcount = abs(sum(AROUND));
                BoardFINAL = (r,c) = BOMBcount;
            end
        end 
    end 
end

I was able to figure out the first part but stuck on the rest.

[Walter Roberson]

Suppose Board(1,2) = 1 and Board(2,1) = -1 and Board(2,2) = 0, and suppose Board(1,1) is not -1. Then sum([1,-1,0]) would be 0. The bomb count for Board(1,1) would be determined to be 0, even though there are bombs adjacent to it.

It seems clear that you should not be taking abs(sum(AROUND))

Answer 1

[Walter Roberson]

You can do the calculations without if/elseif .

Use max(1,r-1:r+1) to clip against the top margin. Use min(row, r-1:r+1) to clip against the bottom margin.

Do likewise for columns.

The resulting range of subscripts will be suitable for indexing just the appropriate box at each point.

[Walter Roberson]

Alternately, take your array and pad it on left, right, top bottom with 0. Now you can always just access padded_board(r:r+2,c:c+2) without exceeding the array bounds; you will get the 0 of the padding margin anyplace that you would otherwise have gone outside the bounds.

[Joshua]

i need to use the if else statement

[Walter Roberson]

elseif r == 1 && c == col
    AROUND = [Board(r,c-1),Board(r+1,c),Board(r+1,c-1)];

and so on.