[R] NAs introduced by coercion warning?

[Omar Gonzalez Post]

I'm running cluster analysis on a data frame but when I calculate the distance 
I get this warning "NAs introduced by coercion".  What does this mean?

                                          
        [[alternative HTML version deleted]]

______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.