[R] creating a dynamic output vector

[Greg Snow]

Look at ?get and possibly ?Filter (new to 2.6.0), do they help with what
you want?  

-- 
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at intermountainmail.org
(801) 408-8111
 
 

> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] On Behalf Of Steve Powers
> Sent: Wednesday, November 07, 2007 4:42 PM
> To: Peter Alspach
> Cc: r-help at r-project.org
> Subject: Re: [R] creating a dynamic output vector
> 
> Not exactly. That doesn't work for me. Because I don't 
> actually know what variables are created each time I run the 
> program, I don't have an easy way to call all the ones I need 
> at once (which your suggestion appears to require). But I do 
> have a list of names for all the variables I want. We need to 
> match based on variable names I think.
> 
> Note that elements of NAMES correspond to exact variables, 
> but with quotes around them.
> 
> If I just knew how to tell R to call NAMES[1], NAMES[2], 
> NAMES[3] etc., but without quotes (so that the variable 
> itself is called, rather than the header string), that might 
> work. But when NAMES[1]="varA," the code / noquote(NAMES[1])/
> 
> literally returns /varA/, rather than the desired 
> value/string that comes out when I manually type the code 
> varA. Weird.---steve
> 
> 
> 
> 
> Peter Alspach wrote:
> > Steve
> >
> > Is this the sort of thing you mean?
> >
> > output <- character(26)
> > names(output) <- paste('var', LETTERS[1:26], sep='')
> > output
> > output[paste('var', LETTERS[c(2,4,6,7,16)], sep='')] <- c(1, pi,
> > letters[1:3])
> > output 
> >
> > Peter Alspach
> >
> >   
> >> -----Original Message-----
> >> From: r-help-bounces at r-project.org 
> >> [mailto:r-help-bounces at r-project.org] On Behalf Of Steve Powers
> >> Sent: Thursday, 8 November 2007 11:27 a.m.
> >> To: r-help at r-project.org
> >> Subject: [R] creating a dynamic output vector
> >>
> >> Let's say I have a program that returns variables whose names 
> >> may be any string within the vector 
> >> NAMES=c("varA","varB","varC","varD","varE","varF"..."varZ"), 
> >> but I do not ever know which ones have actually been created. 
> >> So in one example output, "varA", "varC", and "varD" could 
> >> exist, but in another example output "varA", "varD", 
> >> "varE",and "varF" exist, with no pattern or predictability 
> >> (different combinations can come out, as well as different 
> >> numbers of variables).
> >>
> >> How do assign the output values, in pre-arranged order, into 
> >> an output vector? The output vector for the first example 
> >> would be OUTPUTS=c(varA, NA, varC, varD...) and the output 
> >> vector for the second example would be OUTPUTS=c(varA, NA, 
> >> NA, varD, varE, varF...).  In other words, the rows for all 
> >> potential returned values need to be retained in the order 
> >> set by NAMES, and the values all need to be plugged into 
> >> their respective spot in that order if they exist. Otherwise 
> >> NA is plugged in.
> >>
> >> One other factor is that some outputs are values, but others 
> >> are text. Tips?
> >>
> >>
> >> Using R version 2.4 on Windows XP
> >>
> >> ______________________________________________
> >> R-help at 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.
> >>
> >>     
> >
> >
> 
> ______________________________________________
> R-help at 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.
>