[R] pdf files in loops

[Paul Hiemstra]

James Rome wrote:
> On 3/31/2010 10:01 PM, Berwin A Turlach wrote:
>
> G'day James,
>
> On Wed, 31 Mar 2010 21:44:31 -0400
> James Rome <jamesrome at gmail.com> wrote:
>
>
>   
>> I need to make a bunch of PDF files of histograms. 
>>   
>>     
> [...]
>
>   
>> What am I doing wrong?
>>   
>>     
> http://cran.ms.unimelb.edu.au/doc/FAQ/R-FAQ.html#Why-do-lattice_002ftrellis-graphics-not-work_003f
>
> HTH.
>
> Cheers,
>
> 	Berwin
>
> --------------------------
> I got it. Thanks. I forgot to assign the graph to a variable. :-(
>
> for( gate in gatelist) {
>     outfile = paste("../", airport, "/", airport, "taxiHistogram", gate,
> ".pdf", sep="")
>     pdf(file = outfile, width = 10, height=8, par(lwd=1))           
>     title=paste("Taxi time for Arrival Gate", gate, "by Runway at", airport)
>     gdf = mdf[mdf$ArrivalGate == gate, ]
>     gdf$tt= gdf$TaxiTime/60           
>     g = histogram(~(gdf$tt) | gdf$Runway, data=gdf, type="count",
> ylab="Count",    breaks=20, main=title,
>        xlab="taxi time (min)",  par.strip.text=list(cex=0.7))
>     print(g)
>     dev.off()           
> }
>
> works. Is there a way to make all the plots pages in one pdf file?
>   
Hi,

Put the pdf() and the dev.off() outside the loop and the plots will be 
on separate pages in the same pdf file.

pdf()
loop
dev.off()

cheers,
Paul
> Thanks,
> Jim
>
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>   


-- 
Drs. Paul Hiemstra
Department of Physical Geography
Faculty of Geosciences
University of Utrecht
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