[Kst] Antw: Re: NAN and filters

Gunter Koenigsmann Gunter.Koenigsmann at semikron.com
Wed Jul 13 08:58:22 UTC 2016

Dear Ben,

>Have you tried "Interpret empty value as" *zero* or *previous value*?

That works fine - and since a NaN cannot give a meaningful result in an
FFT I am happy with the results of especially the second of these
options. But since there is no warning why the filter did only output
zeros finding out that one has to select this option currently tends to
need loads of troubleshooting => I wouldn't be too unhappy if a filter
would output a warning message telling why it has failed. In order to
keep the impact low I assume it is best to just test if one byte the FFT
has returned is a NaN.
And since the specific case feels like it were potentially common I
wonder if it would make sense to handle the case that the last line of a
file only contains a CR, but no data and no time information

I will attach a simple test file to this e-mail that makes the low-pass
filter fail without looking too suspicious as long as your text editor
doesn't provide line numbering.


A few days ago I have tested the current nightly build. With the
official release there were frequent crashes both on Windows and on
Linux (KST is being so fast that even having to redo the last minute's
work every now and then doesn't stop it from saving time). The current
nightly build no more crashes for me => wanted to report this positive
news, too.

Kind regards,


Gunter Königsmann

Tel:     +49 911-6559-6025
Fax:    +49 911-6559-776747

gunter.koenigsmann at semikron.com 

SEMIKRON Elektronik GmbH & Co. KG 
Sigmundstrasse 200, 90431 Nürnberg, Germany 
Amtsgericht Nürnberg HRA 13650
SEMIKRON Elektronik Verwaltungs GmbH
Amtsgericht Nürnberg HRB 21338
Harald Jäger
Christian Müller
Peter Sontheimer

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