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.
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 Ãster 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
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