[R] Using windows() and jpeg()

Duncan Murdoch murdoch at stats.uwo.ca
Mon Nov 19 22:54:13 CET 2007

On 19/11/2007 3:09 PM, Irina Burmenko wrote:
> Hello,
> I have the following question, which I haven't been able to resolve after days of trying.  I used to save my plots as jpegs using the savePlot command.  However, that seems to result in lost resolution.  So now I'm trying to use the jpeg( ) function, but am having trouble because it seems to be incompatible with the windows (width=, height=) command.  It's important for me to be able to specify the window size as well as other parameters.  Here is the sample code:
> jpeg(filename="myplot.jpg",quality=100)
> windows(width=6.25, height = 3.75)

The jpeg() command should *replace* the windows() command.  They both
open new graphics devices.  One problem you'll have is that jpeg takes 
dimensions in pixels by default; if you want to express it in inches, 
you need to say so, and also say what resolution you're assuming.  For 

jpeg(filename="myplot.jpg",quality=100,width=6.25, height = 3.75, 

for 96 dpi resolution.

Duncan Murdoch

> par(pin=c(3.5,1.5),bty="l")
> par(mar=c(2.5,4.1,2.2,10.5))
> x<-c(1,2,3)
> y<-c(4,5,6)
> plot(x,y,"b")
> dev.off()
> Using these commands results in an empty plot being saved.  However, skipping lines 2-4 saves the graph, but, of course, without the formatting, which is important to me.  Any help would be greatly appreciated.
> Irina
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