Chip Barnaby wrote:
> Peter,
> My method seems to work, see below. Is there some reason it might not
> work in general? This is the tersest way I have found to rename, but
> it seems awkward, given that names( X) is repeated.
>
Nono, this technique works fine. It just wasn't what you wrote.... (look
closer!)
-p
> Chip Barnaby
> --------------------------
>
> > head( airquality)
> Ozone Solar.R Wind Temp Month Day
> 1 41 190 7.4 67 5 1
> 2 36 118 8.0 72 5 2
> 3 12 149 12.6 74 5 3
> 4 18 313 11.5 62 5 4
> 5 NA NA 14.3 56 5 5
> 6 28 NA 14.9 66 5 6
> >
> > names( airquality)[names( airquality)=="Ozone"]<-"O3"
> > head( airquality)
> O3 Solar.R Wind Temp Month Day
> 1 41 190 7.4 67 5 1
> 2 36 118 8.0 72 5 2
> 3 12 149 12.6 74 5 3
> 4 18 313 11.5 62 5 4
> 5 NA NA 14.3 56 5 5
> 6 28 NA 14.9 66 5 6
> >
>
>
> At 11:19 AM 5/5/2008, Peter Dalgaard wrote:
>> Chip Barnaby wrote:
>> > Dear all,
>> >
>> > Is there a less cumbersome way to rename a column by name (as opposed
>> > to index) than --
>> >
>> > names( X)[ names[ X] == "bob"]<-"sue"
>> >
>> > ?
>> Not that I know of (notwithstanding that your code doesn't quite work as
>> it stands...). You might have thought that this would work, but it
>> obviously does not:
>>
>> > names(airquality["Ozone"]) <- "O3"
>> > head(airquality)
>> Ozone Solar.R Wind Temp Month Day
>> 1 41 190 7.4 67 5 1
>> 2 36 118 8.0 72 5 2
>> 3 12 149 12.6 74 5 3
>> 4 18 313 11.5 62 5 4
>> 5 NA NA 14.3 56 5 5
>> 6 28 NA 14.9 66 5 6
>>
>> (This is probably a design decision. In the same vein,
>>
>> airquality[6] <- data.frame(foo=1:153)
>>
>> will not change the name of column 6. It might be preferable if it did,
>> from the conceptual point of view, but it is one of those things where I
>> suspect that the world comes tumbling down if you try to change the
>> behaviour...)
>>
>> >
>> > A semi-related question: how does one get the index of a column by
>> > name, something along the lines of col.index( X, "sue") ?
>> >
>> match("sue", names(X))
>>
>> --
>> O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B
>> c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K
>> (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
>> ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907
>
> ---------------------------------------------------------
> Chip Barnaby [EMAIL PROTECTED]
> Vice President of Research
> Wrightsoft Corp. 781-862-8719 x118 voice
> 131 Hartwell Ave 781-861-2058 fax
> Lexington, MA 02421 www.wrightsoft.com
> ---------------------------------------------------------
>
>
--
O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B
c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907
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