R help - Jul 2008 - Exporting a Graph that has lines()

I'm trying to export a graph (any form is good). I'm trying to export
one
that uses plot() then lines(). however, it seems that the jpeg format and
the pdf format only takes the first line plot, and doesn't even consider the
additional plots. My code is the following:
	
output_file<-paste(filez,".pdf",sep="")
pdf(output_file)
plot((x_data) ~ (y_data), main = filez)
lines (x,z,col="red")
dev.off()

The pdf only comes out with the graph of the plot, and not of the lines.
Does anyone know how to export multiple graph items on one plot?

Thanks!
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R_Learner wrote:
> I'm trying to export a graph (any form is good). I'm trying to
export one
> that uses plot() then lines(). however, it seems that the jpeg format and
> the pdf format only takes the first line plot, and doesn't even
consider the
> additional plots. My code is the following:
> 	
> output_file<-paste(filez,".pdf",sep="")
> pdf(output_file)
> plot((x_data) ~ (y_data), main = filez)
> lines (x,z,col="red")
> dev.off()
>
> The pdf only comes out with the graph of the plot, and not of the lines.
> Does anyone know how to export multiple graph items on one plot?
>
> Thanks!
>   
That shouldn't be a problem, but the above is not reproducible without 
the data.  Are you sure that you actually executed the dev.off()? 
(pasting it onto the command line is not enough).

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