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
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