[R] Question about ggplot2

[William Dunlap]

> -----Original Message-----
> From: Brian Diggs [mailto:diggsb at ohsu.edu] 
> Sent: Thursday, May 26, 2011 2:59 PM
> To: William Dunlap
> Cc: Julian TszKin Chan; r-help at r-project.org
> Subject: Re: Question about ggplot2
> 
> On 5/26/2011 2:15 PM, William Dunlap wrote:
> > eval(substitute(
> >    
> qplot(x=xVariable,y=yVariable,data=diamonds,geom=c('point','smooth')),
> >    list(xVariable=as.name("carat"), yVariable=as.name("price"))
> > ))
> 
> Well, yes, I suppose there is that.  I've mentally (perhaps 
> inappropriately) lumped substitute() with parse() as being subject to 
> fortune(106) and have avoided it.

If a function uses substitute() or its equivalent to avoid evaluating
its arguments in the normal way, you are pretty much forced to use
eval() with the output of substitute() or call() or use do.call()
to evaluate the arguments it will not evaluate for itself.


 
> 
> And this is also why I have learned to say "I don't know 
> of..." rather 
> than "There is not..." :)
> 
> > Bill Dunlap
> > Spotfire, TIBCO Software
> > wdunlap tibco.com
> >
> >> -----Original Message-----
> >> From: r-help-bounces at r-project.org
> >> [mailto:r-help-bounces at r-project.org] On Behalf Of Brian Diggs
> >> Sent: Thursday, May 26, 2011 2:07 PM
> >> To: Julian TszKin Chan
> >> Cc: r-help at r-project.org
> >> Subject: Re: [R] Question about ggplot2
> >>
> >> On 5/26/2011 12:29 PM, Julian TszKin Chan wrote:
> >>> Hi all,
> >>>
> >>> Is there any way for me to to string in the argument of
> >> qplot or ggplot? for
> >>> example
> >>>
> >>> qplot(x='carat',y='price',data=diamonds,geom=c('point','smooth'))
> >>> instead of
> >>> qplot(x=carat,y=price,data=diamonds,geom=c('point','smooth'))
> >>
> >> I don't know of a way using qplot, but it is possible with
> >> ggplot.  Use
> >> aes_string instead of aes:
> >>
> >> ggplot(diamonds, aes(x=carat, y=price)) + geom_point() + 
> geom_smooth()
> >>
> >> ggplot(diamonds, aes_string(x="carat", y="price")) + geom_point() +
> >> geom_smooth()
> >>
> >>>    Thanks!!
> >>>
> >>> Regards,
> >>> TszKin Julian
> >>>
> >>> 	[[alternative HTML version deleted]]
> >>
> >> --
> >> Brian S. Diggs, PhD
> >> Senior Research Associate, Department of Surgery
> >> Oregon Health&  Science University
> >>
> >> ______________________________________________
> >> R-help at r-project.org 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.
> >>
> >
> 
> 
> -- 
> Brian S. Diggs, PhD
> Senior Research Associate, Department of Surgery
> Oregon Health & Science University
>