corr returns NaN

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D
D 2011-7-7
回答： Bio_Ing_Sapienza 2019-2-24
I'm calculating the correlation coefficient between two vectors, using corr. It returns NaN, and I'm curious to know why that is the case.
c and d are the vectors.
>> [c d]
ans =
1 1
2 1
2 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
2 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1

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采纳的回答

Sean de Wolski
Sean de Wolski 2011-7-7
read the:
doc corr
and you'll see it's not what you want. Are you looking for :
doc corrcoef %?
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Sean de Wolski
Sean de Wolski 2011-7-7
It's because there's no variance/ standard deviation in the second column and thus in the correlation coefficient calculation when you divide by std or var (however it's implemented) you're in turn dividing zero by zero which yield nan.
D
D 2011-7-7
Thank you. I missed that.

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更多回答（1 个）

Bio_Ing_Sapienza
Bio_Ing_Sapienza 2019-2-24
Maybe you have to ceck for "Inf" components in your array. Sometimes I was searching from Nan even if I had already checked them out. But there are other kind of Matlab numeric representation for results came from division that yields to too large numbers to be represented with floating number. So check also for these ones!

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