[R] mean

[Roy Mendelssohn - NOAA Federal]

Use is.numeric(list)  on the list to see if it is a list of numbers or if it is list of characters.  If it is a list of characters  (which could be the case if you read it in using read.csv or the like) and it makes sense to convert to numeric, then do something like:

list<-as.numeric(list)

-Roy
On Aug 30, 2013, at 5:18 AM, agnes69 <festre at gredeg.cnrs.fr> wrote:

> When I try to apply mean to a list, I get the answer :
> 
> argument is not numeric or logical: returning NA
> 
> Could you help me?
> 
> (I am a very beginner)
> 
> 
> 
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**********************
Roy Mendelssohn
Supervisory Operations Research Analyst
NOAA/NMFS
Environmental Research Division
Southwest Fisheries Science Center
1352 Lighthouse Avenue
Pacific Grove, CA 93950-2097

e-mail: Roy.Mendelssohn at noaa.gov (Note new e-mail address)
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