Thread: plotting problem

Started: 2006-08-01 23:00:14
Last activity: 2006-08-01 23:00:14
Topics: SAC Help
LANGLAUDE Philippe - CETE Méditerr./LABO NICE/RISQUE NATUREL - G
2006-08-01 23:00:14
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 ?


Philippe Langlaude
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Equipe de Recherche "Risques Sismiques" CETE méditerranée
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* Philippe.Langlaude<at>i-carre.net
http://www.cete-mediterranee.fr



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