This value should be zero, why is it not zero?

2015 2 1
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更新时间：2015 2 1
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>> X
X =
90 60 45 100 15 23 52 30 71 88
>> xbar
xbar =
57.4000
>> diffx
diffx =
32.6000 2.6000 -12.4000 42.6000 -42.4000 -34.4000 -5.4000 -27.4000 13.6000 30.6000
>> clear sum;
>> sum(diffx)
ans =
1.4211e-14
>>
1.4211e-14
>>

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Matt J
Matt J 2015-2-1
编辑：Matt J 2015-2-1

1 个投票

You generated the diffx data (and summed it) with inexact floating point arithmetic, as all computers do.

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