R help - Jul 2012 - saving contour() plot info

{ I think this message got rejected at the 1st attempt - trying again}

R 2.15.1 , windows XP

I have a  very non-stationary  bivariate  time-series - say  {xt,yt}  t=1 ...
lots.

I want to do a bivariate density contour-plot of the whole series and then  step
through the series 1 second at a time plotting that second's  {x,y} subset
on top of the contour
plot and losing the previous second's subset so that the effect enables you
to see
an 'animation' of how the series 'travels' through  different
parts of the joint density  as time passes.

The only way I've found to do this is to repeatedly call contour() before
plotting  each
seconds-worth of data ... this works, but because of the time taken to do the 
contour()
calculations in each step of the loop , it has an unpleasant flashing
appearance.

Is it possible to run contour() just once and save the contour- plotting info,
so that in each
step of the loop I only have do the actual plotting of the contours?

Or any other way of achieving the desired outcome.

Grateful for any guidance      ...     Bob Kinley

	[[alternative HTML version deleted]]

On 03/07/2012 10:36 AM, Robert Douglas Kinley wrote:
> { I think this message got rejected at the 1st attempt - trying again}
>
> R 2.15.1 , windows XP
>
> I have a  very non-stationary  bivariate  time-series - say  {xt,yt}  t=1
... lots.
>
> I want to do a bivariate density contour-plot of the whole series and then 
step
> through the series 1 second at a time plotting that second's  {x,y}
subset on top of the contour
> plot and losing the previous second's subset so that the effect enables
you to see
> an 'animation' of how the series 'travels' through 
different parts of the joint density  as time passes.
>
> The only way I've found to do this is to repeatedly call contour()
before plotting  each
> seconds-worth of data ... this works, but because of the time taken to do
the  contour()
> calculations in each step of the loop , it has an unpleasant flashing
appearance.
Generally the way to get rid of the flashing is to use dev.hold() while 
plotting, then dev.flush() when done.  This isn't supported on all 
graphics devices.
>
> Is it possible to run contour() just once and save the contour- plotting
info, so that in each
> step of the loop I only have do the actual plotting of the contours?
It is possible to save the contour information.  See ?contourLines. This 
doesn't save everything (e.g. the labelling), but it might be enough for 
you.

You could also try using recordPlot() after plotting the contours, then 
replayPlot() when you want to reproduce them.

Duncan Murdoch
>
> Or any other way of achieving the desired outcome.
>
> Grateful for any guidance      ...     Bob Kinley
>
> 	[[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.