[R] missing values

[Ulrich Leopold]

David Barron wrote:
> Try tapply(lsk0t50$Pox2, lsk0t50$ProfN, sum,na.rm=TRUE)

I tried but some strange things happen. The columns after Pox2 change into 
Pox2 and for some Nas I get now 0 as a result.

How can I apply the above command to avoid mixing columns. The imported file 
was a tab seperated file.

Ulrich


> Dave
> 
> ----- Original Message -----
> From: "Ulrich Leopold" <uleopold at science.uva.nl>
> To: <r-help at stat.math.ethz.ch>
> Sent: Thursday, June 27, 2002 7:56 AM
> Subject: [R] missing values
> 
> 
> 
>>Dear list,
>>
>>how can I exclude the missing values in the following example:
>>
>>tapply(lsk0t50$Pox2, lsk0t50$ProfN, sum)
>>
>>I tried:
>>
>>tapply(lsk0t50$Pox2, lsk0t50$ProfN, sum, Fun=is.na(lsk0t50$Pox2))
>>
>>But it returns a lot of missing values in the result. Instead the missing
>>values in the variable should not be taken into account. So that I get
> 
> only
> 
>>a NA as result if there are only NAs for the corresponding factor.
>>
>>Any idea how this can be achieved?
>>
>>Thanks,
>>Ulrich
>>--
>>__________________________________________________
>>
>>Ulrich Leopold MSc.
>>
>>Department of Physical Geography
>>Institute for Biodiversity and Ecosystem Dynamics
>>Faculty of Science
>>University of Amsterdam
>>Nieuwe Achtergracht 166
>>NL-1018WV Amsterdam
>>
>>Phone: +31-(0)20-525-7456 (7451 Secretary)
>>Fax:   +31-(0)20-525-7431
>>Email: uleopold at science.uva.nl
>>http://www.frw.uva.nl/soil/Welcome.html
>>
>>Check us also out at:
>>Netherlands Centre for Geo-ecological Research
>>http://www.frw.uva.nl/icg
>>
>>
>>
>>-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.
> 
> -.-.-
> 
>>r-help mailing list -- Read
> 
> http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
> 
>>Send "info", "help", or "[un]subscribe"
>>(in the "body", not the subject !)  To: r-help-request at stat.math.ethz.ch
>>
> 
> _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._.
> _._
> 
>>
> 


-- 
__________________________________________________

Ulrich Leopold MSc.

Department of Physical Geography
Institute for Biodiversity and Ecosystem Dynamics
Faculty of Science
University of Amsterdam
Nieuwe Achtergracht 166
NL-1018WV Amsterdam

Phone: +31-(0)20-525-7456 (7451 Secretary)
Fax:   +31-(0)20-525-7431
Email: uleopold at science.uva.nl
http://www.frw.uva.nl/soil/Welcome.html

Check us also out at:
Netherlands Centre for Geo-ecological Research
http://www.frw.uva.nl/icg



-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !)  To: r-help-request at stat.math.ethz.ch
_._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._