问题描述：
>> p=[1 0 3 12 7]
p =
1 0 3 12 7
>> roots(p)
? Subscript indices must either be real positive integers or logicals.
>>
p =
1 0 3 12 7
>> roots(p)
? Subscript indices must either be real positive integers or logicals.
>>
问题解答：
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