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Re: [Seisunix] suwind

vld3

4 Nov 2020 4 Nov '20

4:16 p.m.

Hello everyone I would like to apply a derivative to a signal. I made a test with a simple cosine (created with suvibro) applying suop op=diff ... but I didn't get a sine. Why? thanks in advance -- luca

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Dominique ROUSSET

4 Nov 4 Nov

4:45 p.m.

Hi, I agree with you. Comparing the outputs of suvibro f1=0.5 f2=0.5 | suxgraph style=normal width=1500 title=normal suvibro f1=0.5 f2=0.5 | suop of=diff | suxgraph style=normal width=1500 title=normal it looks like there is an absolute value somewhere in the data flow. Notice that abs is the default option. So, I suspect a bug.... The code needs to be checked. D. On 04/11/2020 17:16, vld3 wrote:

Hello everyone I would like to apply a derivative to a signal. I made a test with a simple cosine (created with suvibro) applying suop op=diff ... but I didn't get a sine. Why? thanks in advance -- luca _______________________________________________ Seisunix mailing list Seisunix(a)mailman.seismic-unix.org https://mailman.seismic-unix.org/listinfo/seisunix

-- |Dominique Rousset LFCR UMR5150 / E2S UPPA / Dpt des géosciences| |Univ. Pau et des Pays de l'Adour BP 1155 F-64013 Pau Cedex - France| |mailto:dominique.rousset@univ-pau.fr jami:drousset http://lfc.univ-pau.fr| |Off: +33 559 407 423|Cell: +33 660 861 391|xmpp: dominique(a)rousset.nom.fr|

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Shuki Ronen

5:44 p.m.

I think I had this problems some time ago and wrote a quick and dirty time differentiator. Attached TAZ. -- Shuki On Wed, Nov 4, 2020 at 8:50 AM Dominique ROUSSET < dominique.rousset(a)univ-pau.fr> wrote:

Hi, I agree with you. Comparing the outputs of suvibro f1=0.5 f2=0.5 | suxgraph style=normal width=1500 title=normal suvibro f1=0.5 f2=0.5 | suop of=diff | suxgraph style=normal width=1500 title=normal it looks like there is an absolute value somewhere in the data flow. Notice that abs is the default option. So, I suspect a bug.... The code needs to be checked. D. On 04/11/2020 17:16, vld3 wrote: Hello everyone I would like to apply a derivative to a signal. I made a test with a simple cosine (created with suvibro) applying suop op=diff ... but I didn't get a sine. Why? thanks in advance -- luca _______________________________________________ Seisunix mailing listSeisunix@mailman.seismic-unix.orghttps://mailman.seismic-unix.org/listinfo/seisunix -- |Dominique Rousset LFCR UMR5150 / E2S UPPA / Dpt des géosciences| |Univ. Pau et des Pays de l'Adour BP 1155 F-64013 Pau Cedex - France| |mailto:dominique.rousset@univ-pau.fr <dominique.rousset(a)univ-pau.fr> jami:drousset http://lfc.univ-pau.fr| |Off: +33 559 407 423|Cell: +33 660 861 391|xmpp: dominique(a)rousset.nom.fr| _______________________________________________ Seisunix mailing list Seisunix(a)mailman.seismic-unix.org https://mailman.seismic-unix.org/listinfo/seisunix

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Dominique ROUSSET

5:56 p.m.

Sorry, there was a nasty typo in my command ! using suvibro f1=0.5 f2=0.5 | suop op=diff | suxgraph style=normal width=1500 title=normal the result looks correct with some perturbations due to the beginning and end tapers D. On 04/11/2020 17:45, Dominique ROUSSET wrote:

suvibro f1=0.5 f2=0.5 | suop of=diff | suxgraph style=normal width=1500 title=normal

-- |Dominique Rousset LFCR UMR5150 / E2S UPPA / Dpt des géosciences| |Univ. Pau et des Pays de l'Adour BP 1155 F-64013 Pau Cedex - France| |mailto:dominique.rousset@univ-pau.fr jami:drousset http://lfc.univ-pau.fr| |Off: +33 559 407 423|Cell: +33 660 861 391|xmpp: dominique(a)rousset.nom.fr|

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vld3

5 Nov 5 Nov

7:53 a.m.

Yes ... I controlled: the problem is only on beginning and end ... this image is from suvibro f1=10 f2=10 tv=10 t1=0 t2=0 | suop op=diff (green) luk On 04/11/2020 18:56, Dominique ROUSSET wrote:

Sorry, there was a nasty typo in my command ! using suvibro f1=0.5 f2=0.5 | suop op=diff | suxgraph style=normal width=1500 title=normal the result looks correct with some perturbations due to the beginning and end tapers D. On 04/11/2020 17:45, Dominique ROUSSET wrote:

suvibro f1=0.5 f2=0.5 | suop of=diff | suxgraph style=normal width=1500 title=normal

-- |Dominique Rousset LFCR UMR5150 / E2S UPPA / Dpt des géosciences| |Univ. Pau et des Pays de l'Adour BP 1155 F-64013 Pau Cedex - France| |mailto:dominique.rousset@univ-pau.fr jami:drousset http://lfc.univ-pau.fr| |Off: +33 559 407 423|Cell: +33 660 861 391|xmpp:dominique@rousset.nom.fr| _______________________________________________ Seisunix mailing list Seisunix(a)mailman.seismic-unix.org https://mailman.seismic-unix.org/listinfo/seisunix

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Dominique ROUSSET
Shuki Ronen
vld3