warning message in rcorr function

Question

[Edalat]

hi all, when I want to calculate correlation by rcorr,the number of non coding is 23 and the number of coding is 634,R shows this warning message,what should I do?

res2=rcorr(coding,ncoding,type = "spearman")

Warning message:

In sqrt(npair - 2) : NaNs produced

I think because of Inequality of number of coding & noncoding there is this warning and for that reason I have NA at the end of correlation matrix,is it true?

[Jean-Karim Heriche]

When npair <2, R can't calculate the square root. This is likely caused by your input not being of adequate dimensions. Check dim(coding) and dim(ncoding).

Answer 1

[Edalat]

Hi Jean,

dim(coding)

[1] 23 635

dim(ncoding)

[1] 23 24

23 is the number of samples ,24 and 635 is the number of coding and ncoding{23 noncoding+1 column that related to myfactor(the name of samples ) & 634coding+1 column that related to myfactor} ,what is the problem?

[Jean-Karim Heriche]

Please use the 'Add reply' button to reply to a comment. This keeps the discussion organized. Also, don't create an answer to provide information as this gives the impression the question has already been answered. What are those +1 columns ? Are they numeric ?

[Edalat]

you have a right,it is not Intentional.

no, the column was the name of sample,actually I removed that column by this function t4 <- t3[,-11] and now there is no that error.