R help - Sep 2007 - return(x=x,y=y,prob=prob) hasn't been used in R now?

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?
#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.

-- 
With Kind Regards,

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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@gmail.com
Website: www.statABC.com
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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.
> #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.
>
>   

-- 
   O__  ---- Peter Dalgaard             ?ster Farimagsgade 5, Entr.B
  c/ /'_ --- Dept. of Biostatistics     PO Box 2099, 1014 Cph. K
 (*) \(*) -- University of Copenhagen   Denmark          Ph:  (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)                  FAX: (+45) 35327907

Hi!

Use a list structure for all the components you want to have returned 
by the function:


return(list(x=x, y=y, prob=prob))



Christian