[SAC-HELP] (no subject)

"LANGLAUDE Philippe - CETE Méditerr./LABO NICE/RISQUE NATUREL - GEOLOGIE" Philippe.Langlaude at i-carre.net
Tue Aug 1 06:52:35 PDT 2006


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





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