写一个：定义一个不规则矩形，遍历二维数组，判断鞍点是否越界的lua代码

以下是符合您要求的 Lua 代码：

-- 定义不规则矩形
local rectangle = {
    {1, 2},
    {3, 4},
    {5, 6, 7},
    {8, 9, 10},
    {11}
}

-- 计算鞍点
local function findSaddlePoint(matrix)
    local row = #matrix
    local col = #matrix[1]
    for i = 1, row do
        for j = 1, col do
            local value = matrix[i][j]
            local isSaddlePoint = true
            -- 判断是否为行最小值
            for k = 1, col do
                if matrix[i][k] < value then
                    isSaddlePoint = false
                    break
                end
            end
            -- 判断是否为列最大值
            if isSaddlePoint then
                for k = 1, row do
                    if matrix[k][j] > value then
                        isSaddlePoint = false
                        break
                    end
                end
            end
            -- 判断是否越界
            if isSaddlePoint and (i > row or j > #matrix[i]) then
                return false
            end
        end
    end
    return true
end

-- 遍历二维数组，判断鞍点是否越界
for i = 1, #rectangle do
    local row = rectangle[i]
    for j = 1, #row do
        local element = row[j]
        if findSaddlePoint(rectangle) then
            print("Saddle point found at (" .. i .. ", " .. j .. ")")
        else
            print("No saddle point found at (" .. i .. ", " .. j .. ")")
        end
    end
end

其中 `rectangle` 是一个不规则矩形，`findSaddlePoint` 函数用于计算矩阵中的鞍点，并判断是否越界。最后遍历矩阵中的每个元素，调用 `findSaddlePoint` 函数判断是否存在鞍点，并输出结果。