[R] adding lines to multiple plot

[Gary W]

Hi ben

Thanks for that, the density lines have now worked, however i was hoping
that the labels would be the names of the columns in my original data set
not numeric.  any advice how to do this?

gary w



Ben Bolker wrote:
> 
>> 
>> ##find unique column names in table 
>> variablenames<-unique(names(variables)) 
>> ## define number of unique names 
>> Nvariables<-length(variablenames) 
>> for(i in 1:Nvariables){ 
>> par(mfrow=c(1,1),ask=TRUE) 
>> } 
> 
>   previous loop is a little weird -- it has exactly the
> same result as just running the command inside once.
> 
> Labeling with the numeric values is a bit of a pain.
> If you don't need them you can just do
> 
> lapply(variables,
>    function(v) {
>       hist(v,prob=TRUE)
>       lines(density(v),lwd=2)
>    })
> 
> If you need the labels you can either do
> 
> mapply(function(v,i) {
>    hist(v,prob=TRUE,main=paste("Histogram of",i),xlab=i)
>       lines(density(v),lwd=2)
>      },
>      variables,
>      1:Nvariables)
> 
> Or it might be easier to just do the whole thing with 
> a for loop:
> 
> for (i in 1:Nvariables) {
>   hist(variables[[i]],prob=TRUE,main=paste("Histogram of",i),xlab=i)
>       lines(density(variables[[i]]),lwd=2)
> }
> 
>   Ben Bolker
> 
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> 
> 

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