[R] NAs introduced by coercion warning?

[Sundar Dorai-Raj]

Jonathan Greenberg wrote:

> I'm running a decision tree on a large dataset, and I'm getting multiple
> instances of "NAs introduced by coercion" (> 50).  What does this mean?
> 
> --j
> 

My guess would be you're trying to convert from character to numeric and 
are unable to do so. As in,

 > as.numeric("A")
[1] NA
Warning message:
NAs introduced by coercion
 > as.numeric("1")
[1] 1
 >

But without more information from you it's impossible to tell.

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http://www.R-project.org/posting-guide.html

Regards,
Sundar