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vrf how to delete a file in VEE

Question asked by VRFuser on Nov 10, 2003
Thanks to Jay and Larry for your answers.

Larry, your suggestion does more than I had accomplished, but the start time
(from) must always be 0 with a waveform.  I wanted to display a waveform
that went from negative into positive time (please, no metaphysical
discussions on negative time :o).  I could accomplish this by breaking the
waveform up into a negative and positive half, and feeding them to separate
traces on the waveform object, or by storing the waveform as coords.  I had
just found it convenient in the past to always convert waveform-type data
into a waveform data type if it had inherent time information, such as a
scope trace.  That way I can use the waveform in any function and have
access to this imbedded time mapping.  Ah well...there's always a work
around.

Reiner


-----Original Message-----
From: Jay Nemeth-Johannes [mailto:jay.johannes@completetest.com]
Sent: Monday, November 10, 2003 1:54 PM
To: Schlieker, Reiner; 'VRF'
Subject: RE: [vrf] Waveform question


The short answer is "no".  However, a lot of apps can work around this.
When I argued this with the VEE folks in the past, I received an answer
that it would be difficult to implement because the entire class
structure had been based around a zero time based waveform with an eye
on fft transform.

In the past, when I have needed to add or compare skewed waveforms, I
have simply added or subtracted points on the front end to get the
points to align.  In this case, you want to carry the timebase offset as
a separate variable.  The VEE folks have correctly pointed out that it
doesn't matter for an fft because the trigger timebase offset is a
constant which is cancelled out in the fft process.

Jay Nemeth-Johannes
Complete Test
720 SW 14th Street
Loveland, Colorado 80537

www.completetest.com

> -----Original Message-----
> From: Schlieker, Reiner [mailto:reiner.schlieker@siemens.com]
> Sent: Monday, November 10, 2003 11:15 AM
> To: VRF
> Subject: [vrf] Waveform question
>
> Does anyone know how I could shift a waveform in the time domain -
i.e.
> add
> or subtact an offset value.  Can the waveform data type hold a
waveform
> with
> negative time values?
>
> Thanks,
> _____________________________________
> Reiner Schlieker
> Test Equipment Designer
> Siemens Milltronics Process Instruments Inc.
> Phone: (705) 740-7553
> Fax:     (705) 740-7692
> Email:  reiner.schlieker@siemens.com
> Web:    www.siemens-milltronics.com
>
>
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