> -----Original Message-----
> From: r-help-boun...@r-project.org
> [mailto:r-help-boun...@r-project.org] On Behalf Of Jack Tanner
> Sent: Sunday, March 27, 2011 9:14 PM
> To: r-h...@stat.math.ethz.ch
> Subject: Re: [R] altering a "call" variable from quote()
>
> Jack Tanner <ihok <at> hotmail.com> writes:
>
> > > b = quote(b==3)
> >
> > Now I want to append "&& x > 2" to the value of b. How do I do that?
>
> Never mind, I figured it out:
>
> substitute(b && x > 2, list(b=b))
You can also use call() or as.call():
> e1 <- substitute(b && x > 2, list(b=b))
> e2 <- call("&&", b, quote(x>2))
> e3 <- as.call(list(quote(`&&`), b, quote(x>2)))
> identical(e1,e2) && identical(e1,e3)
[1] TRUE
substitute can be a pain when the first argument is not
a literal expression.
Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com
>
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