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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