问题描述：
matlab sum函数
a=[1 2 3;4 5 6;7 8 9]
a =
1 2 3
4 5 6
7 8 9
>> sum(a)
Index exceeds matrix dimensions.
a=[1 2 3;4 5 6;7 8 9]
a =
1 2 3
4 5 6
7 8 9
>> sum(a)
Index exceeds matrix dimensions.
问题解答：
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