[R] Writing a .pdf file within a function - what do I need to return()?

[R. Michael Weylandt]

See R FAQ 7.22 -- in short, you need to print() your plot to the
graphics device -- just wrap xyplot() in print() and it should work.

Michael

On Tue, Mar 13, 2012 at 3:55 PM, Dgnn <sharkbrainpdx at gmail.com> wrote:
> I am trying to write a function that generates one PDf containing plots from
> several .csv files within a directory.  When I manually execute the code it
> seems to work, but not when it is a function. I think I need to return()
> something, but haven't had much luck figuring out what/how.
>
> plot.isi<-function(csv.path="~/project/csv by cell") {
>        csv.files<-grep('.csv', list.files(path = csv.path, full.names=T), value=T)
>        pdf(file='plots/isi plots.pdf', width=10, height=8)
>        #par(mfrow=c(2,1)) #ideally 2 plots per page, but will work on details
> after fx. works
>        for (i in 1:length(csv.files)){
>                raw.df<-read.csv(csv.files[i])
>                names(raw.df)<-c('t','isi','logic','cond')
>                xyplot(isi ~ t, raw.df, ylim=c(0,1500), ylab='isi', xlab='time',
>                                main=basename(csv.files[i]))
>        }
>        dev.off()
> }
>
> Thank you all for the help,
>
> Jason Deignan
>
>
>
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