From: Edith Hodgen (Edith.Hodgen@nzcer.org.nz)
Date: Tue 17 Jun 2003 - 11:57:46 EST
Message-id: <seef1e67.028@smtp.nzcer.org.nz>
This was discussed in
Date: 1/06/2003 06:00:32
Subject: Re: [R] parse on left hand side of R assignment
On Sat, 31 May 2003, Paul E. Johnson wrote:
> I keep finding myself in a situation where I want to calculate a
> variable name and then use it on the left hand side of an assignment.
> For example
>
> iteration <- 1
> varName <- paste("run",iteration,sep="")
> myList$parse(text=varName) <- aColumn
>
> I want to take some existing variable "aColumn" and use the name
> "varName" name for it and put it into a list "myList". That use fails
> with this error:
.... Snip
For a data frame you could use
mydf[paste("run",iteration,sep="")] <- aColumn
and for a list or a data frame
Robject[[paste("run",iteration,sep="")]] <- aColumn
=================================================
I don't remember if there was any more interesting discussion in the thread.
HTH
Edith
Edith Hodgen
Statistician and Data Manager
New Zealand Council for Educational Research
Phone: +64-4-384 7939 x 812
Fax: +64-4-384 7933
edith.hodgen@nzcer.org.nz
Web site http://www.nzcer.org.nz
>>> Fernando Henrique Ferraz Pereira da Rosa <mentus@gmx.de> 17/06/2003 13:43:42 >>>
Hi, my doubt is very simple. I'm sure I've seen someone using something
like this before, but unfortunatelly my searches in the archives were useless.
Well, I have some objects called after a name that has a number attached to
it,
varying. Let's say I have:
> ls
poly1 poly2 poly3 poly4 poly5 poly6 ...
I would like to access these objects using a for(), in which I could do
something like paste("poly",i,sep=''). For i = 4, for instance I get
> paste("poly",4,=sep'')
[1] "poly8"
Which is a string. What command should I use to 'access' the object named
by this string, ir order to do some useful things, like changing its value?
Thank you,
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