find the longest diagonal sum of a matrix.

Question

Thomas 2023-10-30

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2040301-find-the-longest-diagonal-sum-of-a-matrix

回答： Image Analyst 2023-10-30

function largestDiagonalSum = diag_sum(matrix)
[rows,cols] = size(matrix);
largestDiagonalSum = 0;
for row = 1:rows
    for col = 1:cols
        diagonalSum = 0;
        for dr = [-1, -1, 1, 1]
            for dc = [-1, 1, -1, 1]
                r = row + dr;
                c = col + dc;
                if r >= 1 && r <= rows && c >= 1 && c <= cols
                    diagonalSum = diagonalSum + matrix(r, c);
                end
            end
        end
        if diagonalSum > largestDiagonalSum
            largestDiagonalSum = diagonalSum;
        end
    end
end
% Divide the largest diagonal sum by 4
largestDiagonalSum = largestDiagonalSum / 4;
end 

im not too woried aboout my code as it has to be just good eniugh to get me throiugh this semester of uni, though i keep getting ther erro

>> diag_sum

Not enough input arguments.

Error in diag_sum (line 2)

[rows, cols] = size(matrix);

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Answer 1

Walter Roberson 2023-10-30

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2040301-find-the-longest-diagonal-sum-of-a-matrix#answer_1343151

When you press the green Run button, that is equivalent to running the function from the command line with no parameters.

When you run a function and do not pass parameters to it, then inside the function, any variable named on the function line remains undefined (unless you assign it a value.)

Under no circumstances will MATLAB go hunting around in the calling environment trying to find a variable named in the function line to use the value of inside the function.