[Kst] NAN and filters

Ben Lewis benlewis003 at gmail.com
Wed Jun 29 23:26:07 UTC 2016

Hi Gunter,

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

Regards, Ben

On 29/06/2016 11:34 PM, Gunter Koenigsmann wrote:
> Dear all,
> I've just encountered a problem that technically is no bug but as I
> have spent about an hour in tracking it down I thought I'd better report
> it to the developers:
> My Tektronix scope is willing to save the acquired data in  a CSV
> formats. The first few lines are headers. Then there is data - and the
> very last line of the file consists of only a newline with no characters
> besides that.
> kst knows how to skip headers and even knows how to extract information
> from them. It also is real fast in reading the data. But the completely
> empty line at the end of the file by default is interpreted as NaN.
> Everything now looks fine. Curves are drawn, but if I try to
> low-pass-filter them the result is a vector of the size 0:
> The filter tried to fourier-transform a curve containing a NaN and the
> result was all NaNs.
> Don't kow if in the case that the filter generated zero data a test if
> this was the cause would be a good idea or a mechanism that ignores a
> totally empty line at the end of a file. But I at least wanted to report
> that I found this.
> Kind regards,
>   Gunter.
> Gunter Königsmann
> Tel:     +49 911-6559-6025
> Fax:    +49 911-6559-776747
> www.semikron.com
> gunter.koenigsmann at semikron.com
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