[R] return(x=x,y=y,prob=prob) hasn't been used in R now?

[Zhang Honglian]

   I don't know what exactly you want the program to do. But if you want to let
   the function to return several values in the same time, you have to put them
   into a list. E.g. in the following program, the function will return 4
   different things, x and y are vectors, prob is a matrix and p is a scalor.
   Hope this helps,

   Honglian

   a<-function(x,y)

   {

   gx<-seq(1,x,length.out=y)

   gy<-gx

   prob<-matrix(gy,nrow=2)

   for (i in 1:y)

   {

   for (j in 1:y) p<-0.1

   }

   lst<-list(x=gx,y=gy,prob=prob, p=p)

   return(lst)

   }

   b=a(10, 20)

       ______________________________________________________________

     From:  "zhijie zhang" <epistat at gmail.com>
     To:  "Prof Brian Ripley" <ripley at stats.ox.ac.uk>
     CC:  R-help at stat.math.ethz.ch
     Subject:  Re: [R] return(x=x,y=y,prob=prob) hasn't been used in R now?
     Date:  Sun, 23 Sep 2007 22:03:22 +0800
     >Dear Prof. Brian Ripley,
     >   You are absolutely right. The warning message in R for my Chinese
     Windows
     >system is Chinese words, so i translate it into english, which maybe not
     >that exact  in the meanings.
     >   Thanks very much.
     >
     >
     >On 9/23/07, Prof Brian Ripley <ripley at stats.ox.ac.uk> wrote:
     > >
     > > On Sun, 23 Sep 2007, Peter Dalgaard wrote:
     > >
     > > > zhijie zhang wrote:
     > > >> Dear friends,
     >  >  >>  Now,  when i use the argument return(x=x,y=y,prob=prob) ,
     R  displays
     > > the
     > > >> waring message:
     > > >> Warning message:
     > > >> The return value for multiple variables wasn't used  in: return(x =
     x,
     > > y =
     > > >> gy, prob = prob)
     > > >>  I used the methods of  "help.search("return")" and "?return" to
     get
     > > some
     > > >> help, but didn't find info on it.
     > > >>  Anybody knows how it should be used correctly?
     > > >>
     > > > Return(value) takes only one argument. To return a list,
     > > > return(list(x=x,y=y,prob=prob))
     > > >
     > > > I bet the author of help(return) thought that this was implied
     clearly
     > > > enough.
     > >
     > > and the warning message in English is not what is quoted here:
     > >
     > > > f <- function() return(x=pi, y=pi)
     > > > f()
     > > $x
     > > [1] 3.141593
     > >
     > > $y
     > > [1] 3.141593
     > >
     > > Warning message:
     > > In return(x = pi, y = pi) : multi-argument returns are deprecated
     > >
     > > so they are in fact used.  What is puzzling is that anyone is still
     trying
     > > to use them years after they were deprecated (and as the help page
     says
     >  >  they were never documented in S, quite how they ever got into
     circulation
     > > in R).
     > >
     > >
     > > >
     > > >> #EXAMPLES
     > > >> a<-function(x,y,z)
     > > >>  {
     > > >>   gx<-seq(1,10,length.out=20)
     > > >>   gy<-gx
     > > >>   prob<-matrix(20,20)
     > > >>   for (i in 1:20)
     > > >>    {
     > > >>     for (j in 1:20)
     > > >>      {
     > > >>       prob<-0.1
     > > >>      }
     > > >>    }
     > > >>  return(x=gx,y=gy,prob=prob)
     > > >>  }
     > > >>
     > > >> a(1,1,1)  # the warning message will display
     > > >>  Thanks.
     > > >>
     > > >>
     > > >
     > > >
     > > >
     > >
     > > --
     > > Brian D. Ripley,                  ripley at stats.ox.ac.uk
     > > Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
     > > University of Oxford,             Tel:  +44 1865 272861 (self)
     > > 1 South Parks Road,                     +44 1865 272866 (PA)
     > > Oxford OX1 3TG, UK                Fax:  +44 1865 272595
     > >
     >
     >
     >
     >--
     >With Kind Regards,
     >
     >oooO:::::::::
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     >::::::(_/::::
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     >[***********************************************************************]
     >Zhi Jie,Zhang ,PHD
     >Tel:86-21-54237149
     >Dept. of Epidemiology,School of Public Health,Fudan University
     >Address:No. 138 Yi Xue Yuan Road,Shanghai,China
     >Postcode:200032
     >Email:epistat at gmail.com
     >Website: www.statABC.com
     >[***********************************************************************]
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     > [[alternative HTML version deleted]]
     >
     >______________________________________________
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     >https://stat.ethz.ch/mailman/listinfo/r-help
     >PLEASE do read the posting guide
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     >and provide commented, minimal, self-contained, reproducible code.
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References

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