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st: Stata graphics speed


From   "Allan Reese (Cefas)" <allan.reese@cefas.co.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Stata graphics speed
Date   Mon, 12 Jun 2006 10:45:31 +0100

Friedrich Huebler <huebler@rocketmail.com> wrote 9 Jun 2006 
Subject: Re: st: Video card and Stata speed

As an example, a fairly detailed map of the world drawn with -tmap-
from SSC takes about one minute to render on my computer. ...
Other Stata graphs like scatter plots or bar charts are *redrawn* [my emphasis] 
instantaneously and virtually nothing would be gained from a new 
video card.
-----

Something I've never understood is why graphs take a long time to appear in the
first place.  Commands like "gen y=_n" happen immediately, even with quite large
numbers of observations.  (I could just notice the delay with obs=1 millon).
In contrast, a simple "scatter y x" with a few observations takes several seconds
before anything appears.  That sometimes applies even when what comes up is a syntax
error.  Can anyone explain?  I've guessed that the delay is while Windows allocates
memory for the graph window, but that is just a guess.

Allan   



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