返回的元素对应于一个月的2016天的输入参数指定struct-s行向量。如果输入不是1到12之间的整数，则函数返回空数组。每个结构体应该包含三个字段，这些字段名为：“月”、“日期”和“日”（全部小写）。(returns a row-vector of struct-s whose elements correspond to the days of a month in 2016 as specified by the input argument. If the input is not an integer between 1 and 12, the function returns the empty array. Each struct should contain three fields with these (exact) field names: month, date, and day (all lower case).)