[R] missing values

Ulrich Leopold uleopold at science.uva.nl
Thu Jun 27 08:56:08 CEST 2002

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?


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

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