If you are looping through and have the names of the files as characters,
say in ticker.names <- c("IBM", ...), you may be able to do this using:
for(nam in ticker.names)
{
[snip...]
eval(parse(text = paste('colnames(', nam, ') <- c(
"open","high","low","close","vol")', sep = '')))
}
HTH,
Jon
--------------------------------------
Jonathan P. Daily
Technician - USGS Leetown Science Center
11649 Leetown Road
Kearneysville WV, 25430
(304) 724-4480
"Is the room still a room when its empty? Does the room,
the thing itself have purpose? Or do we, what's the word... imbue it."
- Jubal Early, Firefly
r-help-boun...@r-project.org wrote on 02/23/2011 10:23:35 AM:
> [image removed]
>
> Re: [R] Using string to call/manipulate an object
>
> Kushan Thakkar
>
> to:
>
> David Winsemius
>
> 02/23/2011 10:55 AM
>
> Sent by:
>
> r-help-boun...@r-project.org
>
> Cc:
>
> r-help
>
> @Scott:
>
> I can't just use
>
> colnames(IBM) <- c("open","high","low","close","vol")
>
>
> I have nearly 100 tickers stored in an vector and I am looping through
them.
> Its not a good idea to hardcode all of them.
>
> @David:
> Column names is just an example. I have a long script that takes in an
xts
> object and performs a series of manipulation. I want to to be able to
run
> the same program on a series of xts objects through a loop. For that I
need
> to be able to able to dynamically point/refer to those xts object inside
my
> loop.
>
>
> On Wed, Feb 23, 2011 at 8:58 AM, David Winsemius
> <dwinsem...@comcast.net>wrote:
>
> >
> > On Feb 23, 2011, at 8:55 AM, Kushan Thakkar wrote:
> >
> > I am using getSymbols function from quantmod package to get price
data
> >> from
> >> internet.
> >>
> >> Currently I have:
> >>
> >> my.ticker <- "IBM"
> >> getSymbols(my.ticker,src="google")
> >>
> >> This creates an xts object named my.ticker which contains historical
> >> price
> >> data for IBM.
> >>
> >> How can I call and manipulating this xts object using my original
string
> >> my.ticker?
> >>
> >> I want to do:
> >> colnames(my.ticker) <- c("open","high","low","close","vol")
> >>
> >
> > If you want to change the colnames (an attribute) of the object now
named
> > "IBM" in your global environment, then look a:
> >
> > ?attributes
> > ?attr
> >
> >
> >
> >> However, this does not work as my.ticker refers to the string "IBM"
rather
> >> than the xts object called IBM.
> >>
> >> Out of desperation, I have also tried:
> >> colnames(paste(my.ticker)) <- c("open","high","low","close","vol")
> >> colnames(as.xts(my.ticker)) <- c("open","high","low","close","vol")
> >>
> >
> > But why are you do this??? It already has a perfectly servicable set
of
> > names:
> >
> > > colnames(get(my.ticker))
> > [1] "IBM.Open" "IBM.High" "IBM.Low" "IBM.Close" "IBM.Volume"
> >
> > --
> > David.
> >
> >>
> >> Thanks
> >> Kushan
> >>
> >> [[alternative HTML version deleted]]
> >>
> >> ______________________________________________
> >> R-help@r-project.org mailing list
> >> https://stat.ethz.ch/mailman/listinfo/r-help
> >> PLEASE do read the posting guide
> >> http://www.R-project.org/posting-guide.html
> >> and provide commented, minimal, self-contained, reproducible code.
> >>
> >
> > David Winsemius, MD
> > West Hartford, CT
> >
> >
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
