Why is is the following function only detecting diagonal functions that that start top left and end bottom right?

Question

The Legend 2019-12-16

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/496917-why-is-is-the-following-function-only-detecting-diagonal-functions-that-that-start-top-left-and-end

编辑： Stephen23 2019-12-16

Why is is the following function only detecting diagonal functions that that start top left and end bottom right ( \ ) and doesn't it detect the mirrored version ( / )

Function checking for connect N

function victory = checkVictory(M, N);
    victory = 0;
    checkWin = @(x)conv2(x,eye(N),'same')>=N | conv2(x,ones(N,1),'same')>=N | conv2(x,ones(1,N),'same')>=N;
    teamOne = checkWin(M == 1);
    teamTwo = checkWin(M == 2);
    
    if any(teamOne(:)) == 1
        victory = 1;
    elseif any(teamTwo(:)) == 1
        victory = 2;
    end
    
end

Output

---------------
| |x| | | | | |
| |x| | | | |o|
| |o|o| | |o|x|
|o|x|o|x|o|x|x|                  % <---- Here it doesn't detect the diagonal connect N (4 in this case)
|o|o|x|o|o|o|x|
|o|x|o|x|x|o|o|
---------------
Input piece in column [player 2]: 4
---------------
| |x| | | | | |
| |x| | | | |o|
| |o|o|o| |o|x|                 % <---- Here it does detect the diagonal connect N (4 in this case)
|o|x|o|x|o|x|x|
|o|o|x|o|o|o|x|
|o|x|o|x|x|o|o|
---------------
Player 2 has won the game!Play again? [yes/no]

Please help me, I'm clueless. All help is greatly appreciated.

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Stephen23 2019-12-16

编辑：Stephen23 2019-12-16

"Please help me, I'm clueless."

Did you try reading my comment which I wrote an hour ago?:

https://www.mathworks.com/matlabcentral/answers/496768-check-if-connect-4-occurs-in-matrix#comment_778446

"Why is is the following function only detecting diagonal functions that that start top left and end bottom right ( \ ) and doesn't it detect the mirrored version ( / )"

Not only did I explain this in my comment I also updated my answer with the very simple fix (based on flipud): is there a particular reason why you are continuing to use the old version?

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Why is is the following function only detecting diagonal functions that that start top left and end bottom right?

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Why is is the following function only detecting diagonal functions that that start top left and end bottom right?

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