Hi Jim,
Thank you for your answer, finally I resolved the problem with this code: 
 
inverse=function(x){
inv<-numeric(length=(length(x)))
for (i in 1:length(x)) inv[i]<-x[length(x)-(i-1)]
return(inv)
}
plot(Barerror$MoyArea~Barerror$Mois,type="l")
polygon(x=c(Barerror$Mois,inverse(Barerror$Mois),Barerror$Mois[1]),y=c(Barerror$MoyArea+Barerror$SdArea,inverse(Barerror$MoyArea-Barerror$SdArea),Barerror$MoyArea[1]+Barerror$SdArea[1]),col="gray",border=NA)
lines(Barerror$MoyArea~Barerror$Mois,lwd=2) 
 
Thanks
Komine
 
 

________________________________
 De : Jim Lemon [via R] <ml-node+s789695n4216146h97@n4.nabble.com>

Envoyé le : Mardi 20 Décembre 2011 1h42
Objet : Re: Polygon


Komine wrote: 

________________________________

Hi Komine, 
I think you want a dispersion band around y (Mean Area). Without the 
data I really can't tell, but the dispersion function in the plotrix 
package using type="l" and fill=<some color> may do what you want. 

Jim 

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