corr returns NaN
显示 更早的评论
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
采纳的回答
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 %?
3 个评论
D
2011-7-7
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
2011-7-7
更多回答（1 个）
Bio_Ing_Sapienza
2019-2-24
1 个投票
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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