But Why ?

Why can not use "<-" ?

On Mon, Mar 9, 2009 at 10:31 PM, Jeff Ryan <jeff.a.ryan@gmail.com> wrote:

> This isn't a bug in R.
>
> You are assigning within the switch statement, and it is returning the
> first TRUE value (human).
>
> Use "=" not "<-"
>
> species <- switch(organism, human="HS", fly="DM", yeast="SC")
> > species
> [1] "SC"
>
>
> HTH
> Jeff
>
> On Mon, Mar 9, 2009 at 8:55 AM, guangchuang yu <guangchuangyu@gmail.com>
> wrote:
> > Hi,
> >
> > When I call the *switch* function first time, it works. but when I call
> it
> > at the second time, it does nothing. The version I use is R version 2.9.0
> > Under development (unstable) (2009-02-21 r47969)
> >
> >
> > here is the output:
> >
> >> organism="human"
> >>     species <- switch(organism,
> >        human <- "Hs",
> >        fly <- "Dm",
> >        mouse <- "Mm",
> >        rat <- "Rn",
> >        yeast <- "Sc"
> >    )
> >  species <- switch(organism,
> > +   human <- "Hs",
> > +   fly <- "Dm",
> > +   mouse <- "Mm",
> > +   rat <- "Rn",
> > +   yeast <- "Sc"
> > +  )
> >> species
> > [1] "Hs"
> >> organism="yeast"
> >>     species <- switch(organism,
> >        human <- "Hs",
> >        fly <- "Dm",
> >        mouse <- "Mm",
> >        rat <- "Rn",
> >        yeast <- "Sc"
> >    )
> >  species <- switch(organism,
> > +   human <- "Hs",
> > +   fly <- "Dm",
> > +   mouse <- "Mm",
> > +   rat <- "Rn",
> > +   yeast <- "Sc"
> > +  )
> >> species
> > [1] "Hs"
> >
> >
> > when I change *organism* to "yeast", and call *switch* function again,
> > *species* suppose to be changed to "Sc", but it remain it's original
> value.
> >
> > You can see my screenshot at
> > http://ygc.azpala.com/2009/03/09/bug-of-r-29-dev
> >
> > --
> > Bests,
> > Guangchuang Yu
> >
> > --~--~---------~--~----~------------~-------~--~----~
> > Rm 848 Dept 9
> > Institute of Radiation Medicine
> > 27 Taiping Rd. Haidian Dist.
> > Beijing, 100850, China
> > Telephone: (86)-010-66931422
> > Mobile: +86-13439009806
> > Email: guangchuangyu@gmail.com
> > -~----------~----~----~----~------~----~------~--~---
> >
> >        [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-devel@r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-devel
> >
>
>
>
> --
> Jeffrey Ryan
> jeffrey.ryan@insightalgo.com
>
> ia: insight algorithmics
> www.insightalgo.com
>



-- 
Bests,
Guangchuang Yu

--~--~---------~--~----~------------~-------~--~----~
Rm 848 Dept 9
Institute of Radiation Medicine
27 Taiping Rd. Haidian Dist.
Beijing, 100850, China
Telephone: (86)-010-66931422
Mobile: +86-13439009806
Email: guangchuangyu@gmail.com
-~----------~----~----~----~------~----~------~--~---

	[[alternative HTML version deleted]]

