From p.dalgaard@biostat.ku.dk  Thu Nov 11 11:46:35 1999
From: p.dalgaard@biostat.ku.dk (Peter Dalgaard BSA)
Date: 11 Nov 1999 12:46:35 +0100
Subject: tapply not simplifying to vector? (PR#320)
In-Reply-To: maechler@stat.math.ethz.ch's message of "Thu, 11 Nov 1999 11:54:10 +0100 (MET)"
References: <199911111054.LAA01914@pubhealth.ku.dk>
Message-ID: <x266z92quc.fsf@blueberry.kubism.ku.dk>

maechler@stat.math.ethz.ch writes:

> I'm pro fixing this.
> and I'll do if I don't hear protests..

Protest!...

> tapply(Ozone,list(Month=Month),mean,na.rm=T)
Month
      May      June      July    August September 
 23.61538  29.44444  59.11538  59.96154  31.44828 

Notice the "Month" in the output.

> dput(tapply(Ozone,list(Month=Month),mean,na.rm=T))
structure(c(23.6153846153846, 29.4444444444444, 59.1153846153846, 
59.9615384615385, 31.4482758620690), .Dim = 5, .Dimnames = structure(list(
    Month = c("May", "June", "July", "August", "September")), .Names = "Month"))

Notice that the Month is the tag name of the single component of the
dimnames vector, it will disappear if you try coercing it to a vector.


-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk)             FAX: (+45) 35327907
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tapply not simplifying to vector? (PR#320)
Peter Dalgaard BSA