R help - Oct 2010 - paste an unevaluated expression

Hi R-users,

 

I would like to create an expression without evaluating it. Then paste
that expression to an object. Example:

 

Result <- paste('Result', 1, sep="")

paste(Result, substitute(apply(exp.des[1:10,], 1, one.row,
parms=parameters)), sep="<-")

 

However this pastes EACH element of the unevaluated expression. Instead
I just would like the expression to be a character string, with just ONE
element.

 

I tried:

 

toString(substitute(apply(exp.des[1:10,], 1, one.row,
parms=parameters)))

 

but it modifies the expression (e.g. removing parenthesis), which I do
not want.

Any idea on how to create an unevaluated expression and paste it to an
object, to get a 1 element output?

 

Thanks for your help

 

Lorenzo


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On Sun, Oct 17, 2010 at 9:14 PM, Lorenzo Cattarino
<l.cattarino at uq.edu.au> wrote:
> Hi R-users,
>
>
>
> I would like to create an expression without evaluating it. Then paste
> that expression to an object. Example:
>
>
>
> Result <- paste('Result', 1, sep="")
>
> paste(Result, substitute(apply(exp.des[1:10,], 1, one.row,
> parms=parameters)), sep="<-")
>
>
>
> However this pastes EACH element of the unevaluated expression. Instead
> I just would like the expression to be a character string, with just ONE
> element.
Try this:

s <- substitute(...whatever...)
paste(Result, format(s), sep = "<-")

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