Wrong mean calculation

2011 11 21
2 个回答
9 次查看（30 天）

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Hello
I notice that when Matlab calculates the Standard deviation of a vector with the exact same values it doesn't returns 0! For example: Vector=ones(100,1)./3; Average=mean(Vector); STDEV=std(Vector);
Moreover if you divide the Vector by say 3456 The average is also wrong (i.e different than any value in the vector)
Thanks in advance itay

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回答（2 个）

Jan
Jan 2011-11-21

0 个投票

No, the calculated values are not wrong.
Calculations with doubles are performed with a limited number of digits. Therefore some rounding effects will occur. See FAQ 6.1

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Itay Barak
Itay Barak
2011-11-21

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