[R] Treat an Unquoted Character String as a Data Frame

[Liviu Andronic]

On Thu, Sep 1, 2011 at 5:48 PM, Jean V Adams <jvadams at usgs.gov> wrote:
> Try this
>
> data <- eval(parse(text=paste(study, level, ".", population, sep="")))
>
..or this:
data <- get(paste(study, level, ".", population, sep=""))

Liviu


> Jean
>
> -----
>
> dbateman wrote on 08/31/2011 17:44:44:
>
> I have several datasets that come from different studies (fv02 and fv03),
> they represent different levels (patients and lesions), and they have
> different patient populations (itt, mitt, mitt3).  I wanted to write some
> code that would pass my three requirements into a function I wrote,
> produce the output, but not have to require me to also pass a unique plot
> title or output filename for each function call.  The title and file name
> would be created in the function according to the three input parameters.
>
> My datasets are named like this (all six are repeated for "fv03" in place
> of "fv02"):
>   fv02patients.itt
>   fv02patients.mitt
>   fv02patients.mitt3
>   fv02lesions.itt
>   fv02lesions.mitt
>   fv02lesions.mitt3
>
> Taking the first dataset as an example, I currently have this code:
>   study="fv02"
>   level="patients"
>   population="itt"
>   noquote(paste(study,level,".",population,sep=""))
>
> This produces the desired fv02patients.itt, but it is just an unquoted
> character string rather than a data frame.
>
> Here is a condensed look at my function:
>
> waterfall=function(data,title,file)
> {       barplot(height=data$brpercent,main=paste("Best Change in Tumor
> Volume\n",title)),
>        savePlot(filename=file,type="pdf")
> }
> waterfall(data=fv02patients.itt,title="EC-FV-02 ITT
> Patients",file=fv02_itt_patients_waterfall")
>
>
> It may be easier to leave it the way I have it, but if this is possible, I
> would still be interested in knowing.
>
>        [[alternative HTML version deleted]]
>
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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.
>



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