Re: [R] Use of recordPlot

From: Greg Snow <Greg.Snow_at_imail.org>
Date: Tue, 22 Apr 2008 09:42:32 -0600

You seem to be confusing several issues.

First, being object oriented does not mean that it matches C++ syntax or that every object is guarenteed to have specific methods. What lead you to think that a recordedplot would have a metafile method? Nothing else has that method, and the only function I find with metafile is the win.metafile graphics device.

The difference between SavedPlots and recordedPlot is the same as the difference between "flock" and "sheep" when talking about a flock of sheep. A recordedPlot object is a single plot, a SavedPlots object is a group of recordedPlot objects (not the plural vs. singular).

Look at the help for "objects" or "ls" (?ls) and look at the 'all.names' argument to see how to find .SavedPlots

R does not use object.method for method dispatch, trying that is confusing the parser and that is why you get an error. Try method(object) instead.

Also recognize that R follows the philosophy of "Source is Real". For what you are trying to do, it will probably work better to write a script or function that creates your plots, then rerun the code when you want the plots again. The current mechanism is useful for a quick paging through plots, but was not meant for much more.

-- 
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow_at_imail.org
(801) 408-8111
 
 


> -----Original Message-----
> From: r-help-bounces_at_r-project.org
> [mailto:r-help-bounces_at_r-project.org] On Behalf Of Beck, Kenneth (STP)
> Sent: Monday, April 21, 2008 4:10 PM
> To: r-help_at_r-project.org
> Subject: [R] Use of recordPlot
>
> I am trying to save plots that I create using calls to
> windows() folowed by multiple calls to plot to place several
> plots on a page. I want to store the plots as variables to be
> able to recall them later.
> The documentation states:
> "Recorded plot histories are of class "SavedPlots". They have
> a print method, and a subset method.
> As the individual plots are of class "recordedplot" they can
> be replayed by printing them: see recordPlot.
> The active plot history is stored in variable .SavedPlots in
> the workspace."
>
> But what does this mean "class SavedPlots"? Is class similar
> to a class in C++?
> Where are the plot() and metafile(), etc methods for this class?
> And if it is saved as a SavedPlots class, then what is a
> "recordedplot"
> class?
> Why the two names? Finally, the .SavedPlots does not appear
> in my workspace at all.
> Where did it go?
>
> Here is a code snippet, why does this not work:
> windows();
> nf1 <- layout(matrix(1), widths=lcm(6), heights=lcm(6))
> par(mfrow=c(2,2)); par (mfg=c(1,1)); plot( ...some stuff...);
> par (mfg=c(1,2); plot(....some more stuff...) par
> (mfg=c(2,1); plot(....some more stuff...) par (mfg=c(2,2);
> plot(....some more stuff...)
>
> plot_save=recordPlot();
>
> # now some more code, doing other stuff, maybe more plots #
> now try to replay the saved plot:
>
> replayPlot(plot_save)
>
> This last line gives the following error:
> Error in replayPlot(plot_save) :
> A clipboard metafile can store only one figure.
>
> The documentation says that replayPlot() has a print method,
> so let's try that: we get the following error:
> Error: unexpected symbol in "replayPlot(lm_hr_plot).print"
>
> Can someone help me understand this, and get routines to save
> and replay plots?
>
> Thanks in advance...
>
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Received on Tue 22 Apr 2008 - 16:05:06 GMT

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