NA's introduced by coercion

Hi,

Hi,

I am applyin function as.numeric to a vector having many values as NA and it
is giving :
Warning message:
NAs introduced by coercion

Can anyone help me to know how to remove this warning and sor it out?

Let's say that the vector you are calling `as.numeric` over is called
`x`. If you could show us the output of the following command:

R> head(x[is.na(as.numeric(x))])

You'll see why you are getting the warning.

How you choose to sort it out probably depends on what you are trying
to do with your data after you convert it to a "numeric"

-steve

Steve Lianoglou
Computational Biologist
Genentech

Hi,

I am applyin function as.numeric to a vector having many values as NA and it is giving :
Warning message:
NAs introduced by coercion

Can anyone help me to know how to remove this warning and sor it out?

You are the one that needs to identify the cause of hte warning: look at the difference in console output for these two examples:

as.numeric( c("a", 1, NA_character_) )

[1] NA  1 NA
Warning message:
NAs introduced by coercion

as.numeric( c("2", 1, NA_character_) )

[1]  2  1 NA

So it is not the NA's in that character vector but rather values that were coerce to NA because the conversion could not be accomplished.

David Winsemius
Alameda, CA, USA