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Started: 2006-08-01 22:52:35
Last activity: 2006-08-01 22:52:35
Topics: SAC Help
LANGLAUDE Philippe - CETE Méditerr./LABO NICE/RISQUE NATUREL - G
2006-08-01 22:52:35
Thank you very much for SAC which is very hepfull for our team

we have a question:

1) we compute 4 spectra (a b c d) with FFT command
these spectra have the same frequency delta.
2) then we divide spectrum "a" by spectrum "b"
the result is noted "E"
3) and we divide spectrum "c" by spectrum "d"
the result is noted "F"
4) Now we want to plot E only for frequencies where F is >3
...
How to do that last operation ?


Equipe de Recherche "Risques Sismiques" CETE méditerranée
* Laboratoire de Nice 56 bd Stalingrad F-06359 Nice cedex 4 France
* Philippe.Langlaude<at>i-carre.net http://www.cete-mediterranee.fr



  • Arthur Snoke
    2006-08-01 17:27:41
    If I understand your question, you can just use xlim 3 XX, where XX is the
    upper limit you want to include in your plot. Do this before your plotsp.


    On Tue, 1 Aug 2006, [UTF-8] "LANGLAUDE Philippe - CETE Méditerr./LABO NICE/RISQUE NATUREL - GEOLOGIE" wrote:

    Thank you very much for SAC which is very hepfull for our team

    we have a question:

    1) we compute 4 spectra (a b c d) with FFT command
    these spectra have the same frequency delta.
    2) then we divide spectrum "a" by spectrum "b"
    the result is noted "E"
    3) and we divide spectrum "c" by spectrum "d"
    the result is noted "F"
    4) Now we want to plot E only for frequencies where F is >3
    ...
    How to do that last operation ?


    Equipe de Recherche "Risques Sismiques" CETE méditerranée
    * Laboratoire de Nice 56 bd Stalingrad F-06359 Nice cedex 4 France
    * Philippe.Langlaude<at>i-carre.net http://www.cete-mediterranee.fr


    _______________________________________________
    sac-help mailing list
    sac-help<at>iris.washington.edu
    http://www.iris.washington.edu/mailman/listinfo/sac-help

  • Arthur Snoke
    2006-08-01 17:29:55
    If I understand your question, you can just use xlim 3 XX, where XX is the
    upper limit you want to include in your plot. Do this before your plotsp.

    On Tue, 1 Aug 2006, [UTF-8] "LANGLAUDE Philippe - CETE Méditerr./LABO NICE/RISQUE NATUREL - GEOLOGIE" wrote:

    Thank you very much for SAC which is very hepfull for our team

    we have a question:

    1) we compute 4 spectra (a b c d) with FFT command
    these spectra have the same frequency delta.
    2) then we divide spectrum "a" by spectrum "b"
    the result is noted "E"
    3) and we divide spectrum "c" by spectrum "d"
    the result is noted "F"
    4) Now we want to plot E only for frequencies where F is >3
    ...
    How to do that last operation ?


    Equipe de Recherche "Risques Sismiques" CETE méditerranée
    * Laboratoire de Nice 56 bd Stalingrad F-06359 Nice cedex 4 France
    * Philippe.Langlaude<at>i-carre.net http://www.cete-mediterranee.fr


    _______________________________________________
    sac-help mailing list
    sac-help<at>iris.washington.edu
    http://www.iris.washington.edu/mailman/listinfo/sac-help

08:36:59 v.f0c1234e