[R] Use function parameter as an unevaluated text string

[Richard M. Heiberger]

doit <- function(data) {
  cat("This function is using values from the data frame",
deparse(substitute(data)), "\n")
}

On Wed, Jan 29, 2014 at 6:48 PM, John Sorkin
<JSorkin at grecc.umaryland.edu> wrote:
> I would like to take a parameter passed to a function as a text string. I don't want the parameter evaluated, I want it uses exactly as passed,
>
> doit <- function(data) {
>
> cat("This function is using values from the data frame ",data,"\n")
>
> }
>
> mydata <- data.frame(x = c(1,2,3), y=c(3,2,1))
> doit(mydata)
>
> I would like to see the following printed
>
> This function is using values from the data frame mydata
>
> Thank you,
> John
>
>
>
>
> John David Sorkin M.D., Ph.D.
> Professor of Medicine
> Chief, Biostatistics and Informatics
> University of Maryland School of Medicine Division of Gerontology and Geriatric Medicine
> Baltimore VA Medical Center
> 10 North Greene Street
> GRECC (BT/18/GR)
> Baltimore, MD 21201-1524
> (Phone) 410-605-7119
> (Fax) 410-605-7913 (Please call phone number above prior to faxing)
>
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