From maechler@stat.math.ethz.ch  Thu Nov 11 15:49:08 1999
From: maechler@stat.math.ethz.ch (maechler@stat.math.ethz.ch)
Date: Thu, 11 Nov 1999 16:49:08 +0100 (MET)
Subject: tapply not simplifying to vector? (PR#320)
Message-ID: <199911111549.QAA07201@pubhealth.ku.dk>


>>>>> "PD" == Peter Dalgaard BSA <p.dalgaard@biostat.ku.dk> writes:

    PD> maechler@stat.math.ethz.ch writes:
    >> I'm pro fixing this.
    >> and I'll do if I don't hear protests..

    PD> Protest!...

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

    PD> Notice the "Month" in the output.

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

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

Completely agree with your argument.
 --> I'll change the documentation

Kurt: Another (R<->S) difference for the FAQ.



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tapply not simplifying to vector? (PR#320)
maechler@stat.math.ethz.ch