[R] adding lines to multiple plots

[Gary W]

Hi 

I am trying to add density lines to multiple histograms created using R.  I
have managed to get all 18 lines on the last histogram in the series,
however, i cannot figure out how to get each line appear on the correct
histogram plot.  I know in Matlab there is a hold function, is there
something similar in R?

the following is the code i have used to get mutiple plots and then add all
the lines to the final plot:

##find unique column names in table
variablenames<-unique(names(variables))
## define number of unique names
Nvariables<-length(variablenames)
##for loop required for labelling of histograms and to tell how many hist to
make
for(i in 1:Nvariables){
par(mfrow=c(1,1),ask=TRUE)
} 
##use lapply for dataframes creates hist for each variable and labels
corresponding
##important to have this outside of loop
lapply(names(variables),function(i)hist(variables[[i]],probability=T,main=paste("Histogram
of",i),
xlab=paste(i)))
for(i in 1:Nvariables){
lines(density(variables[[i]],lwd=2))
}

I am pretty sure its a simple explanation, i have just run out of ideas.

Thanks

gary Watmough
PhD Student
University of Southamton
School of Geography
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