[R] Warning message

[jimmy melinard]

hi!
i'm quite new in R and i don't understand why this
statement doesn't work:

> mode(mensuel$VARIANCE.PRIX)
[1] "numeric"
> storage.mode(mensuel$VARIANCE.PRIX)
[1] "integer"
> mean(mensuel$VARIANCE.PRIX)
[1] NA
Warning message: 
argument is not numeric or logical: returning NA in:
mean.default(mensuel$VARIANCE.PRIX) 


Thanks for help!



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