Paste and namespace
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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