[R] column names in data.frame

[Steve Upton]

Hi Louize,

What does names(d2) and str(d2) give you? As Alec has suggested your first
(column) may be just the row names of av_t1, which is a single column.

steve

> -----Original Message-----
> From: Louize Hill [mailto:louize99 at yahoo.co.uk]
> Sent: Thursday, August 19, 2004 8:43 PM
> To: Alec Stephenson; supton at referentia.com; r-help at stat.math.ethz.ch
> Subject: Re: [R] column names in data.frame
> 
> Hi Steve and Alec,
> 
> Thanks for your help - the 2nd column does have a column name ...
> see below:
> 
> > d2
>         av_tl
> 1979 3.520333
> 1980 3.513684
> etc ...
> 
> or maybe I only have 1 column, as I can change "av_tl" to "year",
> "whatever"... but then what is the list of dates (labels)?
> I need to put a name to this column for subsequent analysis.
> Thanks
> Louize
> 
> 
> 
> ----- Original Message -----
> From: "Alec Stephenson" <astephen at efs.mq.edu.au>
> To: <lhill at ipimar.pt>; <supton at referentia.com>; <r-
> help at stat.math.ethz.ch>;
> <louize99 at yahoo.co.uk>
> Sent: Friday, August 20, 2004 1:36 AM
> Subject: Re: [R] column names in data.frame
> 
> 
> > I suspect you are interpreting the column names as a column, whereas in
> > fact you only have a single column data frame, so using
> > names(d2) <- "whatever"
> > will work.
> >
> > Thanks,
> > Alec
> >
> >
> >
> > Alec Stephenson
> > Department of Statistics
> > Macquarie University
> > NSW 2109, Australia
> >
> > >>> louize99 at yahoo.co.uk 08/20/04 10:10am >>>
> > apparently not
> > that gives me the following error:
> >
> > Error in "names<-.default"(`*tmp*`, value = c("year", "av_t1")) :
> >         names attribute [2] must be the same length as the vector [1]
> >
> > presumably because the 2nd column (av_tl) already has a column name,
> > and
> > therefore seems longer?
> >
> >
> > ----- Original Message -----
> > From: "Steve Upton" <supton at referentia.com>
> > To: "'Louize Hill'" <lhill at ipimar.pt>; <r-help at stat.math.ethz.ch>
> > Sent: Friday, August 20, 2004 12:35 AM
> > Subject: RE: [R] column names in data.frame
> >
> >
> > > Is names(d2) <- c("year","av_t1") what you're looking for?
> > >
> > > steve
> > >
> > > > -----Original Message-----
> > > > From: r-help-bounces at stat.math.ethz.ch [mailto:r-help-
> > > > bounces at stat.math.ethz.ch] On Behalf Of Louize Hill
> > > > Sent: Thursday, August 19, 2004 7:26 PM
> > > > To: r-help at stat.math.ethz.ch
> > > > Subject: [R] column names in data.frame
> > > >
> > > > Dear R-help,
> > > > Please can someone explain how to put a column name on an output
> > > > data.frame.
> > > >
> > > > ##Starting with a data.frame with 3 columns (d$Year, d$NoIndiv,
> > d$wtd_tl)
> > > >
> > > > yr_ind <- split (d$NoIndiv, d$Year)
> > > > yr_tl <- split (d$wtd_tl, d$Year)
> > > >
> > > > ann_ind <- sapply (yr_ind, sum)
> > > > ann_tl <- sapply (yr_tl, sum)
> > > >
> > > > av_tl <- ann_tl/ann_ind
> > > >
> > > > d2<- data.frame (av_tl)
> > > >
> > > > ##This gives me a data.frame with columns, the second of which has
> > a
> > > > column
> > > > name (av_tl)
> > > > I have tried
> > > > > d2<- data.frame (year = x, av_tl)
> > > > > d2<- data.frame (x="year", av_tl)
> > > > > d2<- data.frame (x="year", av_tl, check.names = TRUE)
> > > > > d2<- data.frame (year, av_tl)
> > > >
> > > > as well as several combinations with cbind, as.matrix, etc...
> > > > I cannot relate the examples given in ?data.frame with my problem
> > or
> > find
> > > > a
> > > > similar problem in the archives.
> > > > Thanks
> > > > Louize
> > > >
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