how to convert variable name to string?

[Jinsong Zhao-2]

Hi there,

In the following function:

demo.plot <- function( obj ) plot(1:5, obj, xlab = "x")

Then, I use this function as following:

y <- rnorm(5)
demo.plot(y)

It will produce a plot with ylab = "obj", however, I hope to get a plot
with ylab = "y".

Is it possible to convert object/variable name y to a string "y", so I
can set it in demo.plot():

demo.plot <- function( obj ){
    lab.y <- obj.name.2.string(obj) #### I need obj.name.2.string()
    plot(1:5, obj, xlab = "x", ylab = lab.y)
}

I don't know how to define the function obj.name.2.string.

Any suggestion will be greatly appreciated.

Regards,
Jinsong

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[Peter Dalgaard-2]

On Aug 14, 2012, at 16:54 , Jinsong Zhao wrote:

> Hi there,
>
> In the following function:
>
> demo.plot <- function( obj ) plot(1:5, obj, xlab = "x")
>
> Then, I use this function as following:
>
> y <- rnorm(5)
> demo.plot(y)
>
> It will produce a plot with ylab = "obj", however, I hope to get a plot with ylab = "y".
>
> Is it possible to convert object/variable name y to a string "y", so I can set it in demo.plot():
>
> demo.plot <- function( obj ){
>   lab.y <- obj.name.2.string(obj) #### I need obj.name.2.string()
>   plot(1:5, obj, xlab = "x", ylab = lab.y)
> }
>
> I don't know how to define the function obj.name.2.string.
>
> Any suggestion will be greatly appreciated.

The standard trick involves deparse(substitute(....)). Take a look inside plot.default.


>
> Regards,
> Jinsong
>
> ______________________________________________
> [hidden email] 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.

--
Peter Dalgaard, Professor
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: [phone]
Email: [hidden email]  Priv: [hidden email]

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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.