[R] Paste and namespace

[Edith Hodgen]

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 at nzcer.org.nz

           Web site http://www.nzcer.org.nz

>>> Fernando Henrique Ferraz Pereira da Rosa <mentus at 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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