[R] Plots Without Displaying

[Prof Brian Ripley]

On Thu, 17 Aug 2006, Lothar Botelho-Machado wrote:

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> Thank you,
> 
> It seems that a list of plots is just possible using lattice plots. But
> that's a good keyword for me to look for, I appreciate your help!

Actually, that is not a list of *plots*.  The objects stored there are 
more sets of instructions to the print method of what to plot, and you can 
do that for any type of plot.

It is possible to store low-level descriptions of plots and replay them: 
see recordPlot and replayPlot.  BUT, it is preferable to run the 
expressions to create the plot on the new device.


> Christos Hatzis wrote:
> > Yes, you can do that for lattice-based plots.  The functions in the lattice
> > package produce objects of class "trellis" which can be stored in a list and
> > processed or updated at a later time:
> > 
> > library(lattice)
> > attach(barley)
> > plotList <- list(length=3)
> > plotList[[1]] <- xyplot(yield ~ site, data=barley)
> > plotList[[2]] <- xyplot(yield ~ variety, data=barley) 
> > plotList[[3]] <- xyplot(yield ~ year, data=barley)
> > 
> > plotList
> > plotList[[3]] <- update(plotList[[3]], yaxis="Yield (bushels/acre)")
> > print(plotList[[3]])
> > 
> > Obviously, you can store any lattice-based plot in the list.
> > 
> > HTH.
> > 
> > -Christos
> > 
> > Christos Hatzis, Ph.D.
> > Nuvera Biosciences, Inc.
> > 400 West Cummings Park
> > Suite 5350
> > Woburn, MA 01801
> > Tel: 781-938-3830
> > www.nuverabio.com
> >  
> > 
> > 
> > -----Original Message-----
> > From: r-help-bounces at stat.math.ethz.ch
> > [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Lothar
> > Botelho-Machado
> > Sent: Wednesday, August 16, 2006 4:49 PM
> > To: r-help at stat.math.ethz.ch
> > Subject: Re: [R] Plots Without Displaying
> > 
> > Prof Brian Ripley wrote:
> >>> Yes, see
> >>>
> >>> ?jpeg
> >>> ?bitmap
> >>>
> >>> and as you didn't tell us your OS we don't know if these are available 
> >>> to you.
> >>>
> >>> jpeg(file="test.jpg")
> >>> boxplot(sample(100))
> >>> dev.off()
> >>>
> >>> may well work.
> >>>
> >>> 'An Introduction to R' explains about graphics devices, including these.
> >>>
> >>>
> >>> On Wed, 16 Aug 2006, Lothar Botelho-Machado wrote:
> >>>
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> >>>> R Help Mailing List,
> >>>>
> >>>>
> >>>> I'd like to generate a plot that I could display and/or store it as e.g.
> >>>> jpeg. But unfortunately always a plotting window opens. Is it 
> >>>> possible to prevent that?
> >>>>
> >>>> I tried the following:
> >>>> R> bp<-boxplot( sample(100), plot=FALSE)
> >>>>
> >>>> This works somehow, but it only stores data (as discribed in the 
> >>>> help) in bp and it is not possible afaik to display bp later on or 
> >>>> store them as a jpeg.
> >>>>
> >>>> The next:
> >>>> R> p<-plot(sample(100), sample(100), plot=FALSE)
> >>>> ..and also a variant using jpeg() didn't work at all.
> >>>>
> >>>> Is there a way to generally store the plots as object, without 
> >>>> displaying them, or perhaps directly saving them to disc as jpeg?
> >>>>
> >>>> A "Yes" or "No" or any further help/links are appreciated!!!
> >>>
> > 
> > 
> > 
> > Thank you for the explanation and your patience in answering me this
> > obviously very simple question!!
> > 
> > Originally I tried to store plots directly in a list. So writing them
> > directly to disc was just a good alternative. I knew that that jpeg()
> > provides functionality for that, but didn't use it correctly.
> > 
> > Hence, is it also possible to store a plot in a list, somehow?
> > 
> > Kind regards,
> >  Lothar
> 
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-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595