[Kst] Real-time data display without files ?

Dirk Eddelbuettel edd at debian.org
Wed Apr 26 03:39:47 CEST 2006

Hi Barth,

On 25 April 2006 at 00:59, Barth Netterfield wrote:
| You don't need to write any UI.  The data sources are designed to be run-time 
| plugable into the existing UI - they are not so hard to write.  The only real 
| issue for you, I guess, is memory (forgetting old data at the right time).
| But I have allways preferred the separate app approach.

Is there an example, stanza or particular routine you could point me to?

| > New problem and question: can kst 'synchronise' separate sources? If I have
| > several data streams in different files coming at similar but not identical
| > rates and times, then the x-axes 'drift' apart and the simple equations I
| > plotted looked 'jagged'.  Do I have to synchronise this in the logging app
| > which writes the files for kst?
| Sigh... 'fraid so - this is what we do in our apps.  We haven't figured out a 
| general case definition of syncing inside of kst.

That was actually pretty easy to set up, and I am quite pleased with the
result.  Still, may be worthwhile to try a direct plugin.
Now for the new question: I could not see how I could use the existing
plugins to setup a Shewhart-style quality control chart (essentially, mean
plus/minus a fixed number of standard deviations) over a `running' data
window (of, say, the last M points, and only backwards-looking).

Am I missing something obvious?  While it shouldn't be too hard judging from
the existing plugin examples, it is also standard enough that someone else
would have wanted that...

Thanks, Dirk

Hell, there are no rules here - we're trying to accomplish something. 
                                                  -- Thomas A. Edison

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