[R] tapply with unequal length of arguments

[Stefanie von Felten, IPW&IfU]

Hi everyone,

Is it possible to use tapply(x,y,mean) if not all groups of x by y are 
of the same length (for example if you have one missing observation)?

I tried tapply(x,y,mean,na.omit=T) but it doesn't work!

Steffi
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Stefanie von Felten
Doktorandin

ETH Zürich
Institut für Pflanzenwissenschaften
ETH Zentrum, LFW A 2

Telefon: 044 632 85 97
Telefax: 044 632 11 53
e-mail:  stefanie.vonfelten at ipw.agrl.ethz.ch
http://www.ipw.agrl.ethz.ch/~svfelten/

und:

Universität Zürich
Institut für Umweltwissenschaften
Winterthurerstrasse 190
8057 Zürich

Telefon: 044 635 61 23
Telefax: 044 635 57 11
e-mail:  sfelten at uwinst.unizh.ch
http://www.unizh.ch/uwinst/homepages/steffi.html