R help - Dec 2011 - Re : Polygon

HI, 
Sorry Carl, I received your message in my spam folder. Sarah proposed me a good
example of code.
Thank you
Momadou 
 

________________________________
 De : Carl Witthoft [via R] <ml-node+s789695n4188375h96@n4.nabble.com>

Envoyé le : Mardi 13 Décembre 2011 3h34
Objet : Re: Polygon


Please read the posting guide and provide a (small) reproducible example 
of your data. 

The statement "...output does not seem good."  is not very useful. 
Please explain what you would like the polygon area to look like, and 
why you don't like the way it came out.  Links to posted images of the
chart would help too. 


<quote> 
From: Komine <momadou_at_yahoo.fr> 
Date: Mon, 12 Dec 2011 06:58:56 -0800 (PST) 

Hi everybody, 
I have a matrix with 3 columns (Date, MeanArea and SdArea). I want to 
draw a figure showing the variable MeanArea in terms of the Date. But 
instead to use the variable SdArea as bar error, I want to use “polygon 
error”. I use this code but the output does not seem good. 
Poly<read.table("C:\\Users\\Momadou\\Documents\\AreaMonthly.csv",sep=";",dec=",",header=TRUE)
Poly 

y <-MeanArea 
x <-SdArea 
z <-Date 

matplot(x,cbind(y,z),type="n") 
polygon(c(x,rev(x)),c(y,rev(z)),col="grey50") 
Thank you in advance 
-- 

Sent from my Cray XK6 
"Pendeo-navem mei anguillae plena est." 

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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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