R help - May 2010 - plotting density in same plot in loop iteration

Hi R-mailing list

I would have the following set-up below with a simplified data-frame.
Through a loop which includes certain criteria for the densities I would
like to plot the different density-distributions in the same plot. Of
course I hope I don't do any mistakes with all the indexes of the
dataframe.
All I would like to have is the different densities in the same plot
with a general background density d.

In a second step there might be also the need to combine all the
different densities within the loop to one single distribution. 

I would be grateful for any help on this.

Cheers


> a
[1]  1  4  7 11 16 21 23
> b
[1] 15 17 13 23 14 11 12
> c
[1]  0 15  0  0  0  0  0
> d
[1]  0  0  7  0 16  0  0
> e
[1]  0  0  0 11  0 21  0
> f
[1]   0   0 123 124 122 121   0


q<- data.frame(a,b,c,d,e,f)
   a  b  c  d  e   f
1  1 15  0  0  0   0
2  4 17 15  0  0   0
3  7 13  0  7  0 123
4 11 23  0  0 11 124
5 16 14  0 16  0 122
6 21 11  0  0 21 121
7 23 12  0  0  0   0

indx<-which(q[,"a"]==q[,"d"])
indy<-which(q[,"a"]==q[,"e"])

s<-[c(indx,indy),]
std<-sd(S[,"f"])
t<-round(max(q[,"a"]),0)
u<-round(min(q[,"a"]),0)
colnames(v)<-c("a")
D<-q[,"a"]
d<-density(D)


pdf('L')

for (h in length(s[["a"]])) {
for (i in length(S[["a"]])) {

inda<-which(q[h,"a"]==q[h,"d"])
indb<-which(q[i,"a"]==q[i,"e"])


R<-(s[c(inda),"f"]+s[c(indb),"f"])/2

indh<-which(abs(q[,"b"]-R)<=(2*std))
indi<-which(abs(q[,"c"]-R)<=(2*std))
A<-q[indh,c("a","b")]
colnames(A)<- c("a","g")
B<-q[indy,c("a","c")]
colnames(B)<- c("a","g")
C<-rbind(A,B)
c<-density(C[,"a"])

plot(d, col="blue",xlim=c(u,t),ylim=c(0,0.5))
polygon(d, col="blue",border="blue")
lines(c, col="red")

}
}

dev.off()




-- 
Niklaus Hürlimann

Université de Lausanne  
Institut de Minéralogie et Géochimie 
L'Anthropole 
CH-1015 Lausanne 
Suisse

E-mail: Niklaus.Hurlimann@unil.ch
Tel:+41(0)21 692 4452 

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